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Need some help with serious reception issues
I have a T-Mobile Note 3 and using it on AT&T's GoPhone network. The T-Mo version of the N3 has all the frequencies of AT&T, and I can get LTE with it as well. But I usually keep it on HSPA+ because whenever I get LTE, it's always only 1 or 2 bars. I'm running the W03 SlimKat ROM (version 20), with Temasek 3.75 kernel. I've always had some reception issues with AT&T, even when I still had an unlocked Nexus 4 - dropped calls, "fake" bars (shows 4-5 bars but when calling drops to 1-2), messages not going through; but not as bad as I do now with this N3. Maybe it's the ROM/kernel combo, maybe I just haven't noticed it before. But now, in my apartment, even if my phone shows 2-4 bars, calls don't go through half the time both in and outgoing, messages rarely go through, and when I checked the HSPA+ speed right next to a window with all 5 bars, I was getting a 198 ping, 0.2 Mb down and 0.07 up!
My preferred network type is set to GSM/WCDMA auto or GSM/WCDMA preferred (doesn't seem to make a difference between the two). APN settings are standard AT&T phone settings:
MMS proxy: proxy.mobile.att.net
MMS port: 80
APN type: default,supl,mms,hipri
So, since the phone is technically capable of the running on AT&T's network (has all the bands), and APN settings are standard, could it be the ROM/kernel combo? Although I did have these issues, though not as bad, with CM11 nightly and whatever stock ROM it came with, and Darthstalker ROM before that. So any help would be greatly appreciated!