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. 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, select the Messaging icon. Note: 2G and non-AT&T devices are not compatible with AT&T MicroCell. You can also add an approved user by logging in at www.att.com/microcell using your myAT&T account information.
Select the New message icon to send a message to a new recipient.
Enter the short code 6235 (MCEL) as the recipient of the text message, then select the Check icon.
In the message field, enter "Add" followed by the number to add it to the Approved User List (e.g. Add 5555555555), then select SMS to send the text message.
When successfully connected to cell, "AT&T MicroCell" or "AT&T M-Cell" will be displayed in the Notification bar.
If you do not see “AT&T MicroCell” or “AT&T M-Cell”, turn your mobile device (not MicroCell) off, wait 10 seconds and then turn it back on. Note: Depending on the signal strength of the AT&T cell tower, the time for your cell phone to switch to the MicroCell can vary. It may take seconds or up to five minutes.