Quick Summary:
- Enter your number as +44 followed by the UK number without leading zero.
- Enable international roaming and allow short-code SMS before you fly.
- Save the rental desk and support numbers, and whitelist their SMS.
- Use a backup contact method, email, WhatsApp, or a US eSIM.
When you arrange car hire in Los Angeles, the fastest updates often arrive by text message. That can include pick-up instructions, shuttle details, verification codes, payment confirmations, or changes to your reservation. If you are travelling from the UK, the main risks are simple, incorrect number formatting, roaming blocks that stop SMS, and missed notifications while you are in the air or hunting for airport Wi-Fi.
This guide explains how to add a UK mobile number correctly, what can prevent messages arriving in the US, and how to reduce the chance of missing a crucial pick-up message when you land in Los Angeles.
Add your UK mobile number in the correct international format
Most car rental systems in the US expect an international format, even if the form label says “mobile”. Use the E.164 style, which starts with a plus sign and your country code.
For a UK mobile number, use +44, then your mobile number without the leading zero. For example, if your number starts 07xxx, you enter +447xxx. The same rule applies to UK landlines, remove the leading 0 and keep the area code digits.
Common formatting mistakes that cause failed verification texts include:
Keeping the leading 0, such as +4407…, which is invalid.
Using 0044 instead of +44, some forms accept it, many do not.
Adding spaces or brackets, these can be rejected or saved incorrectly.
If the booking flow offers a country selector, choose United Kingdom, then type your number without the 0. If there is no country selector, always include the +44 prefix.
Where to add the number for car hire updates
You will usually have two chances to add or correct your number, during the online reservation, and later through your confirmation or managed booking screen. If you have already booked, check your confirmation email for a manage booking link, then verify that the mobile number is stored with the correct country code.
If you are picking up at the airport, timing matters. For Los Angeles International Airport pick-ups, shuttle instructions and desk messages are common, so ensure your contact details are correct well before travel. For location details and what to expect, see car rental at LAX and the UK-facing page for car hire at Los Angeles LAX.
If you are comparing providers, the messaging and verification process can still depend on the brand’s system. You can review options such as Budget car hire at LAX or Hertz car hire in California at LAX, but your contact number format and roaming readiness are what make messages arrive reliably.
Roaming and SMS issues that stop verification codes arriving
Even with the right format, a UK mobile might not receive US texts for several reasons. The most common is that SMS is blocked when you land because roaming is off or not provisioned correctly.
Before you leave the UK, check these items in your mobile account and phone settings:
International roaming enabled. Some networks require you to opt in via an app or account setting.
Premium or short-code SMS. Verification codes are sometimes sent from short codes or automated services that certain plans block by default.
Spending caps and roaming passes. If you hit a cap, networks may suspend roaming services, including SMS.
Dual SIM behaviour. If you use an eSIM for data and keep your UK SIM for calls and texts, ensure the UK SIM remains active for SMS, and that messages are not routed to the wrong SIM.
Also remember that incoming SMS can be delayed by aircraft mode, network congestion at LAX, or the phone switching between carriers while it settles on a US network.
How to avoid missed pick-up messages at LAX
Pick-up day is when updates matter most. LAX is busy, and you may be moving between terminals, shuttle stops, and parking areas. These steps reduce the chance of missing a text that contains a gate, stall number, shuttle bay, or a one-time passcode.
1) Turn on roaming before you land. While still on the plane, set your phone to allow roaming, then toggle flight mode off once permitted. Give it a few minutes to register on a network.
2) Check notification settings. Make sure your messaging app can show notifications on the lock screen. If you use Focus modes or Do Not Disturb, create an exception for messages.
3) Watch for spam filtering. Some phones silently filter automated SMS. Check “Unknown senders” or spam folders, especially if you are expecting a verification code.
4) Keep your confirmation details accessible. Save your reservation number and key phone numbers in a notes app that works offline. Screenshots also help when you have limited signal.
5) Use email as a parallel channel. Many companies send the same update by email. Make sure your email address is correct and that you can sign in without SMS-only authentication.
What to do if you do not receive the verification SMS
If a verification code does not arrive, try these quick fixes before requesting another code repeatedly, as too many attempts can trigger a security lock.
Toggle flight mode on and off, then wait two minutes.
Manually select a network in your mobile settings, instead of automatic selection.
Restart the phone, especially after swapping SIMs or enabling an eSIM.
Confirm the stored number in your booking details, look for +44 and no leading 0.
Request a voice call code if the option exists. Calls can sometimes get through when SMS is delayed.
If you still cannot receive messages, use a fallback that you control. A travel eSIM provides US data quickly, letting you receive email-based updates, access online booking details, and use in-app messaging if offered. If you have a companion, adding their reachable number as an additional contact can also help, as long as you still keep your own number correctly entered for identity checks.
Using a UK number vs getting a US number
You do not need a US phone number for car hire in Los Angeles, but having one can reduce friction for texts. The trade-off is that changing numbers mid-trip can break verification if your booking is tied to your UK number.
A practical approach is:
Keep your UK number on the reservation for identity, then add a US data option for reliability.
Use Wi-Fi calling carefully. Wi-Fi calling helps with calls and sometimes SMS, but behaviour varies by network and device. Test it before travelling if possible.
Do not remove the UK SIM if you need SMS. Some phones cannot receive texts to a SIM that is not present.
Double-check details for Los Angeles pick-up timing
LAX arrivals from the UK often land in the afternoon or evening, when queues and traffic are heavier. That is exactly when you want your update messages working. Confirm your flight number if requested, your estimated arrival time, and your pick-up location instructions. If you are collecting a larger vehicle, such as a people carrier, allow extra time for locating the correct shuttle or area, and ensure your phone can receive any last-minute assignment messages.
Finally, once you have entered your number, send yourself a test SMS from another device before you fly, and again after you land with roaming enabled. If your phone receives normal SMS, it is much more likely to receive automated car rental updates and verification codes when you need them.
FAQ
Q: How should I format my UK mobile number for car hire in Los Angeles?
A: Use +44 followed by your number without the leading zero, for example +447… rather than 07….
Q: Will I receive pick-up texts at LAX if my UK roaming is off?
A: Usually not. If roaming is disabled, your phone may not register on a US network, so verification codes and updates can fail or arrive late.
Q: Why do verification codes sometimes never arrive even with the right number?
A: Short-code SMS blocks, spam filtering, spending caps, or network registration delays can stop automated messages. Try toggling flight mode and checking filtered message folders.
Q: Should I use a US SIM or eSIM for car hire messages in Los Angeles?
A: A US eSIM is helpful for data and email access, but keep your UK SIM active if the reservation and verification are tied to your UK number.
Q: What is the best backup if I cannot get SMS in the US?
A: Ensure you can access your email without SMS-only login, save your reservation details offline, and use data connectivity to view updates in your booking confirmation.
