I also really like HD15. And I also had a ton of trouble getting it to settle down and be stable. Like you, I posted some questions. I recieved some tips and some questions never received a reply. My issues were with email mainly and a disappearing account. I tried Stock slot, slot-1 for me no difference--in fact I run it out of slot-1 as my daily driver--go figure? I installed it there by accident and it's worked every since.
Back to your problem. Unfortunately, I do not have a magic bullet. I'll just list a few things I did. 1. Be careful about debloating this one. 2. I stopped installing the add-on "S-Note" It seems everthing would be fine then I'd install that and BAM! 3. Watch what apps install to system/app. 4. And this one (I'm guessing) is really important: after a clean wipe and reboot let that thing set there for a long while! I waited at least 20 minutes! before you even breath on it!
Finally, APN Settings (remember to save) AT&T Phone, phone, http://mmsc.mobile.att.net
, proxy.mobile.att.net, 80, default,mms,supl,hipri (SAVE) then delete all others.
Choose Network Mode> GSM/WCDMA/LTE (auto connect). Next, check Airplane Mode box--wait a minute then uncheck. Goto: More》About Phone》Status: check type and mobile network state (should be LTE and connected respectively) note: make sure wi-fi is off.
I hope it works. Let me know if you need clarification.
oh yeah, I'd really read up on NB1 kit kat before I took the plunge--especially with no root yet
Originally Posted by Guedeaux
I am having a similar problem. I flashed RL15, ATT comp, then modules. Everything seemed to be woking fine, but I can't connect to the internet over mobile data. Also, the mobile network comes in and out, and although I can send texts and and make calls, I can't receive either. MY GPS is working fine. I checked the APN settings, and it matches what I thought its suppose to. I can't figure it out. Maybe these issues are related... Love the ROM and really hope I can figure it out so I can continue to use it.