1. To use your new AT&T 3G or 4G phone with an AT&T Microcell, it must be within signal range and added to the approved user list.
   
2. To add a device to your approved user list, from the home screen of the device you set up as the AT&T Microcell's primary number, tap the Messages icon.
   Note: You can also add an approved user by logging in at www.att.com/microcell using your myAT&T account information.
   
3. Tap the Create Text Message icon to send a message to a new recipient.
   
4. Enter the short code 6235 (MCEL) as the recipient of the text message.
   
5. In the message field, enter "Add" followed by the phone number to add to the Approved User List.
   
6. Tap the Send icon.
   
7. When successfully connected, the cell phone will show "AT&T MicroCell" or "AT&T M-Cell".