Not Getting Verification Codes After Switching Carriers? Fixes That Work

If verification codes stopped arriving after you switched carriers, first make sure the number transfer is really finished and restart your phone. Then check for blocked short codes, filtered or spam folders, and leftover iMessage or RCS settings from your old phone. If only one app refuses to send a code, it may not accept your type of number.

Work down this list in order to get your verification codes flowing again. The first fixes take a minute; the later ones solve the less common problems. Everything here was checked against Apple, Google and carrier help pages in October 2026.

1. Make sure the transfer is really finished

Your number isn’t fully on your new carrier until the carrier tells you the transfer is complete. Even then, texts can lag a little. Google’s account help page says that if you’ve just switched mobile providers while keeping the same phone number, text messaging may not work immediately, and to wait before trying again. Google Fi’s help pages mention a possible 48-hour delay before texting works after a transfer to Fi.

• Ask your new carrier to confirm the transfer is complete. If it’s taking longer than they quoted, see what to do when a number transfer is stuck or rejected.
• Don’t keep tapping “resend.” Google says that when you request several codes, only the newest one works, and it limits how many account recovery codes you can request in one day.

2. Restart your phone and check the basics

1. Restart your phone. Apple recommends it for texting problems, and Google Fi says to restart once your transfer is complete so the new settings apply.
2. Check your signal and airplane mode. Make sure airplane mode is off and you have service. Apple notes that regular SMS texts need a cellular connection, unless you’ve turned on Wi-Fi Calling.
3. Make sure the right line is on. On an iPhone, go to Settings, then Cellular, and check that your phone line is turned on. If you have more than one SIM or eSIM, Apple says to make sure the number you want to use is turned on.
4. Check the SIM and your balance. Google’s Messages help says to make sure a physical SIM card is seated properly and that your plan or prepaid balance covers texting.

3. Get your new carrier’s settings

iPhone: Apple says that after you set up a new eSIM or put in a new SIM card, you might need to download the carrier settings for your new carrier. Connect to Wi-Fi or cellular, go to Settings, then General, then About, and follow the onscreen prompt if one appears. Apple explains this on its carrier settings page.

Android: Google says to make sure you have the latest version of Google Messages and that it’s set as your default texting app. If your phone uses a different texting app, check that the app is current and set as the default.

4. Ask your carrier about blocked short codes

Many automated services, Google among them, send codes from short codes: special short numbers used for automated texts instead of regular 10-digit phone numbers. If codes from several services fail while texts from friends arrive fine, short codes are a likely suspect.

Google’s own account help page says your mobile provider might have inadvertently blocked you from getting texts from services that use short codes, and to ask your carrier to unblock them. When you call:

• Tell them you aren’t receiving verification texts from short codes since your number moved, and name a couple of the services.
• Ask them to check for message blocks on your line. At Verizon, blocks show on the Blocks page in My Verizon, and only the Account Owner or an Account Manager can remove them. T-Mobile’s Message Blocking feature can be turned on or off only by the Primary Account Holder, though T-Mobile says it doesn’t block standard-rated short code messages. Either way, the carrier can look at your line and tell you what’s blocked.

5. Look for verification codes in filtered and spam folders

Sometimes the code did arrive. It just landed somewhere you didn’t look.

• iPhone (iOS 26): If Screen Unknown Senders is on, texts from numbers that aren’t in your contacts go to the Unknown Senders filter. Open Messages, tap the Filters button, then tap Unknown Senders. Apple says notifications for time-sensitive messages, like verification codes, are on by default. You can turn screening off in Settings, then Apps, then Messages, under Unknown Senders.
• Android (Google Messages): Tap More options, then Spam & blocked. If the sender is listed, unblock it.
• Blocked numbers: If you ever blocked a service’s number, its codes won’t come through. Check the same place you block numbers (see our guides for iPhone and Android) and remove the block.

6. Switched phones too? Turn off iMessage or old RCS chats

From iPhone to Android: Apple says that if you switched to a non-Apple phone and aren’t getting RCS or SMS/MMS messages, you might need to deregister iMessage. Google’s Messages help gives the same advice. You can do it on the old iPhone (with your SIM back in it, turn off iMessage and FaceTime in Settings), or online with Apple’s free deregister tool if you no longer have the iPhone. This matters most for texts from people with iPhones, which can keep trying to go through iMessage.

From one Android phone or texting app to another: Google says that if you switch apps or phones and don’t receive messages, you may need to turn off RCS chats on the old one. In Google Messages, that’s your profile picture, then Messages settings, then RCS chats. If you can’t get to the old phone, Google offers a deactivation page at messages.google.com/disable-chat.

7. Check whether the app accepts your kind of number

If codes arrive from most services but one app refuses to send one, or says your number isn’t valid, the problem may be the type of line. Some services only send codes to mobile numbers. OpenAI’s help center, for example, says it doesn’t support landlines, VoIP, Google Voice or premium numbers for phone verification. Google warns that if you use Google Voice to get your Google verification codes, you could lock yourself out of your account.

This often catches people who moved a number to an internet phone (VoIP) service or a landline. If that’s you:

• Look for a “call me” or voice option for the code instead of a text.
• Switch that account to an authenticator app, a passkey or backup codes, if it offers them.
• Contact the app’s support and ask which kinds of numbers it accepts.

For WhatsApp-specific number errors, see our guide to the WhatsApp “not a valid number” error.

8. Use a backup method, then contact support

If you’re locked out right now, use another way in. For a Google Account, Google lists a backup phone number, a saved backup code, a Google prompt on another signed-in phone, and other options. Most banks and apps have their own recovery steps. Then call your carrier with the details: which services fail, since when, and what you’ve already tried.

Before your next switch

• Save backup codes for your important accounts, or set up an authenticator app or passkey.
• If you’re leaving an iPhone, turn off iMessage and FaceTime before you move your SIM.
• Don’t cancel your old service first. The FCC says not to end service with your current company before starting new service with another one.
• Have your account number and transfer PIN ready. Here’s where to find them at Verizon, AT&T, T-Mobile and more.

Frequently Asked Questions

Why am I not getting verification codes after switching carriers?
The most common reasons are a transfer that isn’t fully finished, texts that need a restart or new carrier settings, short codes blocked on your line, codes landing in a filtered or spam folder, or iMessage still active for your number after leaving an iPhone.

How long after a number transfer do texts start working?
Often soon after the transfer finishes, but not always right away. Google says texting may not work immediately after you switch providers and keep your number, and Google Fi mentions up to a 48-hour delay for transfers to Fi.

Do I need to change my phone number on my accounts after switching carriers?
Not if you kept the same number. Your accounts send codes to the number, not to the carrier. You only need to change it on your accounts if your number itself changed.

Why do codes from one app work but not another?
Different services send codes in different ways. One may use a short code your carrier is blocking, and another may refuse certain kinds of numbers, such as VoIP or landline numbers.

Can a VoIP number get verification codes?
Sometimes. Many VoIP services can receive texts, but some apps won’t send codes to VoIP numbers at all. Check the app’s help center, or use an authenticator app if it offers one.

Should I keep requesting new codes until one arrives?
No. Google says only the most recent code works, and it limits how many account recovery codes you can request in one day. Request one, wait a few minutes, and work through the fixes above.

I moved from iPhone to Android and I’m missing texts from iPhone users. What do I do?
Deregister iMessage for your number, either on your old iPhone or with Apple’s online tool. Apple says you should be able to receive texts right away afterward.

Moving a number you bought from us?

If you’re transferring a number from 212areacode.com, plan any sign-ups that need a text code for after your new carrier confirms the transfer is done. It takes 3–5 business days to a mobile carrier and 7–14 business days to a VoIP service or a landline, and your new carrier sets the date (see how it works). Looking for a new number? You can browse available numbers.