How to register a SIM card online

Updated April 17, 2017

A SIM card is a small memory chip that is used in some cell phone models. SIM is an acronym for Subscriber Identity Module. A SIM card is very useful because it makes it easy for cell phone users to switch to a new phone just by taking the SIM card out of the old phone and putting it in the new phone. In the United States, AT&T and T-Mobile use SIM card technology. To register a SIM card, you just need to activate it.


Select the option that best describes your activation type. If you are a new customer, upgrading a phone or adding a line, enter your wireless number, choose your verification method and enter the verification number then select "Next." If you are activating a SIM card for a prepaid phone, select "next" after you choose the option the describes your activation type.

Enter the SIM Card number in the box and click "continue." Your SIM card number is located on the SIM card.

Continue following the prompts and entering the required information.

Visit and select the rate plan that best describes your activation type.

Enter your activation code. This number is located on your activation card directly after the agent code field. Enter you birth date and the select the state of where you want service.

Choose your area code and the city nearest to you. Enter your SIM card number. The number is located on the SIM card. Enter your phone serial number. That number can usually be found underneath the area that holds the battery and on the box your phone came in.

Create a PIN.

Select "Activate PIN."

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About the Author

Fred Wood is a freelance writer and producer based in New York who started writing in 2007. His work can be found at and he contributes to several TV news outlets in his tri-state area, including the CW and CBS networks. He specializes in news, health and lifestyle articles. He earned a Bachelor of Science in broadcast journalism from Jackson State University.