US Phone Number for LLC From Abroad: What the Checks Look At

A US phone number for LLC from abroad sounds like a legal requirement, and the federal rules I read say otherwise. The bank rule on customer identification lists a name, an address and an identification number as the minimum for a company, and a telephone number is not on that list.

Yet the phone is often the first thing an app checks.

PayPal texts a confirmation code the moment a mobile number is added, Google Voice texts a code before it hands out a number, and services sold to businesses can tell what type of line sits behind numbers worldwide. Make sure the phone can actually receive texts before starting any sign-up.

I write from Lisbon, and the official pages on this topic are scattered across a Treasury rule for banks, a standards agency, the FCC and the carriers. Read together, they split the phone question in two.

One job is receiving codes from banks and apps. The other is sending business texts to American customers, and that second job has a registry, fees and carrier rules of its own.

Is a US phone number for LLC from abroad required by law?

No federal rule I found requires one, and the bank rule shows why the question gets confused. Under the customer identification program rule for banks, the minimum a bank collects before opening an account is a name, a date of birth for individuals, an address and an identification number.

For a company, the address can be a principal place of business, local office or other physical location.

A person who is not a US person may give a tax number instead, or a passport number together with the country that issued it. A phone number appears nowhere in that list.

The rule then leaves the method to each bank: “The procedures must enable the bank to form a reasonable belief that it knows the true identity of each customer.”

That sentence is where the phone comes back in.

A bank is free to add its own checks on top of the legal minimum, and application forms do ask for a number anyway. Truist’s published checklist for business deposit accounts, to take one bank’s own page, lists a primary contact number among the personal details, next to a Social Security number and two years of address history.

I read that checklist as a form built for people with an SSN. It also treats a phone number as basic contact data, even though the federal rule never mentions one.

Why do banks and payment apps test the phone line first?

A phone number is quick to verify with a one-time code, and the payment apps describe the routine on their own help pages. PayPal puts it plainly: “When you add a mobile number to your PayPal account, we send you a text message with a confirmation code.”

The code dies after fifteen minutes, by PayPal’s own rule.

Google Voice works the same way before it gives anyone a number. Its setup page asks users to have a phone that is switched on and can get texts, because a code arrives by text to check it.

Security teams know the weak spots of text messages too. Stripe’s help page on two-step login advises users to avoid SMS in favor of more secure options, and says text messages “require cell reception to use, and are vulnerable to” SIM swap and SS7 attacks.

Federal guidance on phone codes sits with NIST, the US standards agency.

Its digital identity guideline, written for US federal agencies, describes a phone that receives codes as one that must “Authenticate to a public mobile telephone network using a SIM card or equivalent secret that uniquely identifies the subscriber.” For codes sent by text or voice, the other option it lists is a wired connection to the public telephone network.

The same guideline asks verifiers to look at warning signs before sending a code by phone. It names a device swap, a SIM change and number porting among them, so a number that was just moved to a new provider is one of those signs.

Checking the line type is an off-the-shelf product now.

Twilio sells a lookup that labels a number as mobile, landline, fixed VoIP or non-fixed VoIP, and it defines the last type as “A virtual phone number obtained online without requiring a physical device.” A business can buy that answer with a single lookup request.

How strict is US virtual phone number business verification?

US virtual phone number business verification depends on what type of virtual number it is, and the published pages split the market in two. Twilio’s lookup page treats a VoIP number tied to a physical device, the type a cable company provides, as fixed VoIP, and an app-only number such as Google Voice as non-fixed.

Interconnected VoIP comes with an address duty under FCC rules.

The FCC requires providers of interconnected VoIP service to handle 911 calls, and one of the duties it lists is to “Obtain a customer’s physical location prior to service activation”. A founder in Madrid asking for a fixed US line should expect to be asked where that line lives.

App-based numbers ask questions too, and Google Voice now asks quite a few. Its help page says “Users who request a new Google Voice number cannot send or receive messages or calls until they complete identity verification.”

That check wants a legal name, a government ID and an address.

A manual review can take a few business days, the page adds. The setup page says users in the US can choose their own number, and it says nothing about users elsewhere.

What a given bank does with a non-fixed VoIP number is the part I cannot see. I have not found a US bank page that publishes which line types it refuses, and Truist’s checklist, for one, simply asks for a primary contact number without naming a type.

My working rule is to keep one line on a real SIM for codes and nothing else.

A mobile number from a network, whether a US plan used abroad or a home number where the bank accepts it, matches the type of phone the NIST guideline describes. An app number bought online is a weaker anchor for a bank login, because nothing on the pages I read says such a number will keep passing these checks.

What is A2P 10DLC, and when does an LLC need it?

A2P 10DLC is the system US carriers use for business texts sent from ordinary ten-digit numbers, and it applies the moment an LLC sends texts from software. Twilio defines it as “the standard that United States telecom carriers have put in place to ensure that SMS traffic to US end users through long code phone numbers is verified and consensual”.

The definition reaches further than the word campaign suggests.

Twilio says US carriers treat any message sent from a platform like its own as application-to-person. An LLC sending order updates or appointment reminders to American customers from a messaging platform falls inside that definition.

Twilio notes one exception on its own platform. A business that only sends user verification codes can use its Verify product instead of registering.

Carriers enforce the rest on their own networks. T-Mobile’s help page on business texting states that “All entities that wish to send sanctioned 10DLC messaging traffic must be registered before their campaign messages will be approved for delivery on our network.”

Skipping the registry has a price on both sides of the pipe. Twilio warns that customers who send from its 10DLC numbers without registering pay additional carrier fees for unregistered traffic, and T-Mobile says businesses on unsanctioned grey routes risk messages that arrive late or not at all.

Receiving codes from a bank never touches any of this.

A founder who only needs to get texts from a bank never meets the registry, and I keep that split in mind whenever phone numbers and LLCs come up in the same breath.

How does A2P 10DLC registration work for a foreign owned LLC?

For A2P 10DLC registration, LLC owners abroad go through The Campaign Registry, usually through their messaging provider, and the registry checks the company before any campaign is approved. Its resources page explains why it asks for a tax number: “This allows TCR to verify the identity of the Brand” and no 10DLC campaign can be registered without that step.

The registry’s published guidance covers this exact case. It addresses US companies and foreign companies that hold a US EIN, and asks them to enter that nine-digit number with a legal company name that matches the IRS registration and is spelled the same way.

The address has to match the IRS records as well. In the registry’s words, “The address you enter should also be the same as that used in registering with the IRS.”

That is where an LLC run from abroad can trip.

Example, invented for illustration: if the EIN letter shows a registered agent’s address in Wyoming and the brand form shows a flat in Lisbon, the two records no longer agree. The registry points brands to the IRS EIN confirmation letter as the place to find the correct name and address.

A founder’s European company with no US EIN takes a different path. The registry asks such brands for the numeric part of their VAT number, and it says its automated VAT matching is optimized for Portugal, Italy and a list of other countries.

The cheapest registration path is closed to foreign founders. Twilio’s help center says “Sole Proprietor Brands are limited to individuals based in the US and Canada.” and the same page shuts it for anyone with an EIN.

Any business with an EIN is pointed to the Low Volume Standard Brand instead, so a US LLC with an EIN registers as a standard or low volume standard brand whatever the owner’s passport says.

The fees are small next to the paperwork.

Twilio lists a one-time brand registration fee of four dollars fifty and a one-time vetting fee of forty-one dollars fifty for a standard brand, plus monthly campaign fees that depend on the use case. A low volume brand can send up to 2,000 segments a day to T-Mobile users, Twilio adds. For a shop in Lisbon sending order updates, I would expect that ceiling to sit well above daily needs.

Each tax number can register up to five standard or low volume brands, according to Twilio. The registration form itself asks for the business name, a physical address, the EIN, a website and an authorized representative with an email and a phone number.

What do carriers expect from the texts themselves?

Registration is only the entry ticket, and the content rules come from the wireless industry’s own code. The CTIA Messaging Principles and Best Practices say “Message Senders should support opt-in mechanisms, and messages should be sent only after the Consumer has opted-in to receive them.”

Bought lists are out under the same code. The document tells senders not to use opt-in lists that were rented, sold or shared, and to build and vet their own.

The CTIA document also asks senders to keep records of each opt-in, such as the time it was given, the way it was collected and the phone number that agreed. Opt-out requests in plain words like stop, end or unsubscribe count as well. A founder in Porto texting US customers is expected to keep that record too.

Regulators work on the other end of the pipe.

When the FCC adopted its first rules aimed at scam texts in 2023, its announcement said the new rules require mobile providers to block certain robotexts that are highly likely to be illegal. Robotext complaints to the agency had risen more than fivefold between 2015 and 2022, the same announcement said.

The blocking targets numbers that are not supposed to send texts at all. The FCC listed invalid, unallocated and unused numbers among them, along with numbers whose owners say they send no texts.

In practice the effect on an LLC is simple. A properly registered campaign on a number the company really holds, with consent recorded for each customer, is the route the carriers built for business messages.

What do the published pages not show?

I have not found a single US bank or payment app that publishes the line types it rejects. The help pages describe codes and expiry times, and the lookup products describe what they can detect, yet the decision rule in between stays private.

I don’t know how often a non-fixed VoIP number fails at sign-up. Forum posts about it exist, and none of them is a source I can check.

The registry publishes no approval rates for brands owned from abroad either. That gap matters more to me than the fees.

I cannot tell whether a foreign founder’s LLC is vetted more slowly than a domestic one, or whether a mismatch between the EIN letter and the brand form is the most common reason for rejection.

The NIST guideline is written for federal agencies, not banks. Each bank writes its own rules, and none of the pages I read promises that a given type of number will pass every time.

Where does that leave a founder abroad?

A short note belongs here before anyone buys a number. The bank that will hold the account can say which phone numbers its own sign-up accepts, the messaging provider can confirm the brand details before registration, and a US lawyer can check consent wording for marketing texts.

My view at Stateside Journal is that the search for a US phone number for LLC from abroad splits cleanly into two jobs, and each has a cheap answer.

For codes, a real mobile line on a SIM is the safest bet, and an authenticator app beats text messages wherever a bank or processor offers one, as Stripe’s own help page suggests. For texting customers, the registry comes first and the first message comes after.

The bank account is the step that comes next.

The phone number on that application deserves the same care as the address, and I will keep checking the registry’s guidance and the carrier pages. The rules for business texts have changed more than once since 2020, and the FCC’s 2023 announcement already asked for comment on further steps.