What "registering to a network" actually means
Registering your phone to a network means telling your carrier's system that your specific device is authorized to use their service. When you buy a phone and set up it with a carrier like Verizon, AT&T, T-Mobile, or a smaller provider, the carrier records your phone's unique identifier (called an IMEI number) in their database and links it to your account. Without this registration, your phone cannot make calls, send texts, or use data on that network, even if you have an active plan.
The process is usually automatic when you buy a phone directly from a carrier or set up a new device through their website or store. But if you're bringing a phone from another carrier, buying used, or switching providers, you may need to register it yourself. The steps vary depending on your carrier and whether your phone is already unlocked.
Key Takeaways
- Registration links your phone's unique IMEI number to your carrier's account so the network recognizes your device as authorized.
- Most carriers register phones automatically when you set up service in their store or online, so you may not need to do anything.
- If you bring a phone from another carrier, you usually need to enter the IMEI number on your new carrier's website or call their customer service line.
- Your phone must be unlocked (not locked to another carrier) before most networks will register it, though some carriers have different rules.
- Registration typically takes a few minutes to a few hours; if your phone still has no signal after that time, contact your carrier's support team.
How to find your phone's IMEI number
Your IMEI is a 15-digit code that uniquely identifies your phone. You need this number to register with most carriers. The easiest way to find it is to open your phone's dialer (the app you use to make calls) and type *#06# — your IMEI will appear on the screen automatically. Do not call this number; just type it and wait a few seconds.
If that does not work, you can find your IMEI in your phone's settings. On Android, go to Settings > About Phone > IMEI Information. On iPhone, go to Settings > General > About and look for the line labeled "IMEI". You can also find it on your phone's original box, on your carrier's account page, or by calling your carrier and providing your account number.
Write down or screenshot your IMEI before you start the registration process. You will need it to complete the registration with your new carrier.
Registering a phone you brought from another carrier
If your phone was previously on a different network, you need to make sure it is unlocked before switching. A locked phone will only work on the carrier that locked it. Most carriers will unlock your phone for free if you have finished paying for it and your account is in good standing. Contact your old carrier and ask them to unlock your device — this usually takes 24 to 48 hours, though some carriers do it when ready.
Once your phone is unlocked, visit your new carrier's website and look for a section called "set up a Device" or "Bring Your Own Phone". You will enter your phone number, IMEI number, and account information. Some carriers let you complete this online; others require you to call or visit a store. After you submit your information, the carrier will register your phone and set up service on your account.
If you are switching to a smaller carrier (sometimes called an MVNO, like Mint Mobile or Visible), the process is the same: unlock your phone with your old carrier first, then register it with the new one through their website or app.
Registering through your carrier's website or app
Most major carriers have online portals where you can register a phone without calling or visiting a store. Log into your account on your carrier's website or open their mobile app. Look for a menu option like "Manage Devices", "Add a Device", or "set up a Phone". Click that option and follow the prompts to enter your IMEI number and confirm your phone model.
The system will verify that your phone is compatible with the carrier's network and that it is not reported as lost or stolen. If everything checks out, your phone will be registered within a few minutes. You should see a confirmation message on screen, and your phone will begin searching for the network signal. Within a few hours, you should have full service.
If the online system does not work or you get an error message, write down the error code and call your carrier's customer service line. They can register your phone manually and troubleshoot any compatibility issues.
What to do if your phone does not connect after registration
After registration, your phone should search for the network and connect automatically. This usually takes a few minutes, but can take up to a few hours. If your phone still shows no signal after several hours, restart it by powering it off and back on. This forces your phone to search for the network again.
If restarting does not work, check that airplane mode is off (swipe down from the top of your screen and look for the airplane icon). Make sure you are in an area with network coverage — use your carrier's coverage map on their website to verify. If you are in a covered area and still have no signal, contact your carrier's support team with your phone number and IMEI. They can check whether your phone is actually registered in their system and whether there are any blocks on your account.
Sometimes registration fails because the IMEI was entered incorrectly, the phone is still locked to another carrier, or the phone is too old to work on the carrier's network. Your carrier's support team can identify which issue is happening and tell you what to do next.
Registering a used or secondhand phone
Used phones can be registered just like new ones, but you need to be careful about a few things. First, make sure the phone is not reported as lost or stolen. You can check this by entering the IMEI on a website like IMEI.info or by asking your carrier to check it for you. If the phone is flagged as stolen, the carrier will not register it.
Second, make sure the phone is unlocked and not tied to another person's account. If the previous owner still has an account with the original carrier, that carrier may refuse to unlock it until the account is closed or the device is removed from it. Contact the previous owner and ask them to unlock the phone, or ask the carrier to verify that the device is available for transfer.
Once you have confirmed the phone is clean and unlocked, follow the same registration steps as you would for any other phone: enter the IMEI on your new carrier's website or call their support line. Registration should complete within a few hours.
Frequently Asked Questions
Do I have to register my phone if I just bought it from my carrier's store?
No. When you buy a phone directly from your carrier and set up it in the store, they register it automatically as part of the set up process. You should have service when ready or within a few hours. If you do not, restart your phone and contact the store where you bought it.
Can I register the same phone on two different carriers at the same time?
No. A phone can only be registered to one carrier at a time. If you want to switch carriers, you must first deactivate your phone with the old carrier (or let the account close), then register it with the new one. Some carriers require you to wait 24 hours between deactivation and registration.
What if my phone is locked and the original carrier will not unlock it?
Contact your carrier's customer service and explain that you want to switch providers. If your device is paid off and your account is in good standing, they are required by law to unlock it. If they refuse, file a complaint with the Federal Communications Commission (FCC) at fcc.gov/complaints. You can also try a third-party unlocking service, though these charge a fee and may not work on all phones.
How long does registration usually take?
Registration itself takes a few minutes to process in the carrier's system. However, your phone may take several hours to connect to the network after registration is complete. If your phone has no signal after 24 hours, contact your carrier — something may have gone wrong during registration.
Can I register my phone if I do not have an active plan yet?
Most carriers require you to have an active plan before they will register a phone. You can usually start a plan online or in a store at the same time you register your device. Some carriers let you register a phone on a prepaid plan that costs as little as $15 to $25 per month.