Find out what to do if you can't make or receive calls on your AT&T mobile phone.
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Try these tips to get your phone working again
Turn your phone off and back on.
Try calling the number again.
Make sure your
device software is up to date
.
Confirm you have wireless service. Make sure you have a signal.
Check our network coverage map
.
Turn off call forwarding
. Press
#21#
on your phone and then the
Call
,
Send
,
Talk
, or
Receiver
key.
Check that you aren’t blocking calls
.
More troubleshooting tips
Turn off airplane mode
. Most phones show an airplane icon when airplane mode is on.
Check your SIM card
. You may have to take it out and put it back in if your phone displays
Insert SIM
or
Emergency Call Only
.
Get device support
.
Service suspended?
Find out how to reactivate your wireless service
.
See a list of blocked calls and why they were blocked with AT&T ActiveArmor
SM
.
Learn more about AT&T ActiveArmor
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Last updated: August 26, 2025
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