Already have a phone, wearable, or device?

Transfer it from another carrier or add it to your current AT&T service.

To make sure your device works on our network, enter your brand and model or its IMEI number. Then, you can order a new SIM or eSIM activation card, or activate your current SIM or eSIM.

For help finding your device’s IMEI, simply select your device and brand, choose your device from the results, and then click Continue.




If you know your device IMEI, enter it here:

IMEI number (15 digits)

Can’t find your IMEI number? Don’t worry, we can help.

Introducing the new AT&T Unlimited Data Plans


Endless entertainment with our best deals ever on unlimited plans. See the Unlimited Data Plans page to learn more and select a plan that’s right for you.

For data only devices, check out DataConnect plans.

Quick facts

Yes, you add a line by logging in to your account and adding a SIM, plan, and services.

Once you have an AT&T SIM and have activated the AT&T SIM card, you can put it in any compatible, unlocked GSM device you choose.

Your new SIM card will be sent to you by mail and arrives ready to use. All you have to do is insert it in your phone or tablet, and you're ready to go.

A SIM card is a microchip that inserts into a compatible mobile device. It identifies you and connects you to the mobile network.

To find out if your device uses a SIM card, a micro-SIM card, or a nano-SIM card, enter your device and brand, or the IMEI number, above. All versions of the iPhone® 5 use a nano-SIM card. iPhone 4/4S uses a micro-SIM. Most 4G LTE Android® phones use a micro-SIM.

To check your vehicle’s compatibility and to activate the mobile hotspot, visit

To use data services on the AT&T network with a device from another carrier or purchased directly from the manufacturer, you may need to program the data settings. If you are using an AT&T branded device, it should already be programmed with the correct settings. For a step-by-step guide to changing your data connection settings, please visit our Programming non-AT&T devices article.