AT&T said to be raising its Upgrade and Activation Fee on January 20
AT&T seems to be following after Verizon, which raised its $20 upgrade fee for device payment plans or full retail purchases to $30. At least AT&T's $5 increase comes off as cheaper.
The upgrade and activation fee is paid when you buy and activate a new smartphone, so you won't see those $25 on your bill until you buy a new phone. Hopefully, this is as expensive as the fee will get.