Open dialer> type *#*#4636#*#*
wait 2-5 seconds, special menu opens. In phone settings press menu key & select auto registration. Additionally for band select WCDMA preferred if you want phone to bounce between Edge & 3G in case you have opted for 3G plan. 3G uses more battery and if you necessarily need 3G all the time select WCDMA only or if you need only Edge select GSM only.
This overrides your regular settings as available in normal menu setting irrespective of whatever is selected. As much as I hate it but the truth is Atrix 2 not the AT&T version definitely has poor network radio reception. Also if your area bounces you between Roaming (local) which is not charged as roaming by Airtel and normal home network it gets worse. I have to stick to a certain room or position which I have identified will not drop my call else I got people always complaining & me fed up as well that call reception is sketchy. It isnt so bad in open area but I really wish someone would really work on India specific Radio image improvement tweaks. Then there is this really annoying problem of Data disconnecting when network goes in to roaming (when on home network but due to a certain tower) though data roaming is activated for roaming. Have to re-enable it a zillion times. This is on JB 4.1.2 leak 1. I tried droid FROAM app by a user who developed it for droid but no dice. On custom PA RC-2 this roam issue data disconnect is solved though but then radio remains weak and also status bar shows no signal bar but when quick settings tiles are pulled down the network tile shows the true reception being received. Another issue in PA is though that in normal menu only 3G option I cannot find and I can enable it only through the developer secret menu
Life is a bitch & then you die, still tryin to get a piece of that apple pie!
Rooted (One Click Method) ME865 running Stock JB 4.1.2 leak # 1 by wanggjghost - converted from originally Asia (India) MB865 (non At&t & non Lte) 1.2 ghz clockspeed & OC on fly using Tweakerz & CWMR using BMM 0.3.4 by Whirleyes & init.d support using 'apk based init.d by Ryu'