[ThisguyfromLA]

I don't know if this method will work on your Motorola phone but it is the procedure I used to remove the AT&T phone book from my LG G2 phone. type in star # star # 2666 # star# star then hit registration to completed and the pop up will disappear.

This worked on my LG V10 that I'm using on Cricket wireless. Thanks!

[Internetdrifter]

Searched and searched the internet to get this annoying AT&T Address Book loading problem to stop (on my unlocked android) to no avail. I just paid closer attention to that loading screen (that would last about a full minute each time I tried to use the phone or access my contacts) when I noticed it said AAB syncing. I checked my settings-apps and sure enough there it was AAB Sync. I looked it up and it is the AT&T Address Book synchronization app. I force stopped it, disabled it, and cleared the cache for it and now, so far, I have not had that loading delay at all. My phone and contacts app pop up immediately! PHEW!!!

[cfischer69]

This worked great on my LG G5! Thanks!

[zuhaib Hassan]

its really worked. thanks alot

[Itzik Goren]

It s does work !
tried it now on a AT&T LG5 and it managed to remove the annoying ATT address book from the dialer.
I did as written above - dialed the sequence from the dialer keypad
* # * # 2666 # * # *
Then a menu was opened, i choose on registration COMPLETED and that's all.
Rebooted my device and successfully got rid from the AT&T address Book sync.
Thank you !

[Alaxee Cowardy]

*#*#2666#*#* worked like magic for me too on my LG G5. Thanks 100 times

[hoang51]

Dialing *#*#2666#*#* and selecting "Registration" and then under "Select Registration Settings", choosing "Completed" definitely removed the issue of AT&T Address Book loading up whenever I use the phone app and it gets stuck at "SIM loading progress". Without doing so, AT&T Address Book would keep on initializing and would not stop. This worked for me on my AT&T LG V10 (H900) with Android 6.0 (H90021Y). This issue popped up after I left AT&T and ported over to T-Mobile over a month ago. Thanks.