How To Activate a New SIM Card ATT

How To Activate a New SIM Card ATT

What is SIM Card?

A SIM card is an integrated circuit intended to securely store an international mobile subscriber identity number and its related key, which are used to identify and authenticate subscribers on mobile telephony devices

How To Activate a New SIM Card ATT

Call us at 877.426. 0525 for automated instructions. You will need to know your SIM/eSIM ICCID & IMEI number for activation.

Frequently Asked Questions

How do I activate my AT&T SIM card in a replacement phone?

Go to Device Support and choose your device. Scroll to Device info, and choose Insert SIM. Then, follow the steps to activate your device.

Why is my new SIM card not working AT&T?

However, we highly recommend you remove the SIM, as damage isn’t the only thing that can cause those errors. If the SIM card reader is dirty, or has dust or debris in it, then it may be unable to read the SIM card. Try wiping down the SIM card with a small cloth, and use compressed air to clean out the SIM card slot.

Can I reactivate my ATT SIM card?

AT&T physical SIM cards cannot be reactivated once deactivated. If you converted your physical Sim to an esim on your iPhone, that function should have worked if done correctly. You will have to call AT&T, from another phone if necessary to have them reactivate the esim with your current phone number.

Do ATT SIM cards need to be activated?

A retail authorized user is a person who calls to activate your SIM when you go into a local AT&T store, and this often happens behind closed doors when you purchase a new phone. If you purchase a new phone from AT&T, the SIM card will be included and already activated, so you don’t have to worry about this process!

Can I just get new SIM card AT&T?

Get a physical SIM card

You can get SIM card kits at one of our stores, online through, or from another online retailer. The kits come with three SIM card sizes. You can use it if you want to bring your own device to AT&T, or if you just need a new physical SIM.

How do I reactivate my AT&T phone number?

Go to Select Reactivate next to the suspended device. Follow the prompts to reactivate it.

Why is my phone saying no SIM AT&T?

Try to power down your device and remove the sim card. Make sure there are no dust or debris by gently wiping the SIM card with a soft cloth. Insert the sim card back into the device and power back on. If you continue to receive the error, you can Factory Reset your device.

How do I find my ATT SIM card number?

On the front of the SIM card you’ll see a 19- or 20-digit number. This is the SIM card number. To activate your device online, visit the Online Activation Portal. You’ll need the wireless number you want to activate and the billing or shipping ZIP Code for the order.

How long does it take to activate eSIM ATT?

The device will download the eSIM in the background and activate your service on this new device while you continue to setup your device. This process may take a few minutes.

Do AT&T SIM cards expire?

A prepaid account is automatically closed if the account balance is $0 for more than 60 days. Once your account is closed, the SIM card is deactivated. As noted above, you need to open a new account with a new SIM card and new number.