[Nexus 7 (2013) LTE Android Development] ksaves2:
Ok, I'm going to have to give RR a try on my 2013 Flo and I do also have a Deb/Razor LTE unit. I root my devices and have TWRP 3.1.1 up. FINALLY mastered backing up and restoring so if I dork a unit I can get it restored. I use adb on Ubuntu for my flashing and rooting (until TWRP is up and I've finally learned not to let Google Play "upgrade" er rather DOWNGRADE TWRP to 3.0.0) and ditched multi-rom probably forever now. Have attempted Lineage and crDroid and unfortunately the deal breaker for me is my VOIP/SIP telephone app, TalkaTone won't work properly on either (yet perhaps). On the WiFi Flo TalkaTone misbehaves and also on the Deb/Razor/LTE N7 2013 I have not had TalkaTone work properly after dialing.

The thing is, the Nexus 2013 LTE can be "trained" to do phone calls via VOIP/SIP over a WiFi link or LTE (Flo can do that trick too on WiFi) and if the Data only SIM card is up and running on the N7 2013 LTE, VOIP/SIP calls may be made using TalkaTone.

It's best and more economical to do it over a fast WiFi link but calls can be made over data at a reasonable data rate on the LTE network. The tradeoff is the call quality is not as "good" as a dedicated cell phone. I only have AT&T GSM service where I'm at

and dropped in a FreedomPop Data only SIM. I spent my trial month religiously working with the service to ferret out all the ups and downs. FP is not so up front mind you but their customer service has improved. I decided to

go with the $30.00 2Gb/month "premiere" service and 500mb of left over data can be non-destructively rolled over every month and banked up to 20Gb. (Not the entire leftover amount I previously thought!) Still it's pretty economical. I locked my N7 2013 LTE down tight as a June bride so there was no "auto-updating" or any other unaccounted for data leaking while on the LTE network. I don't "auto update" anything and make rational decisions of what

I want to "update" and not let Google make that decision for me. Nice thing about the N7 there are apps I don't mind running in the background on WiFi and the N7 allows one to make those decisions. The VOIP/SIP phone and messaging app is the only one I allow to stay on when on LTE as it doesn't incur data toll charges just to be on standby. If I have say a map tracking app I want to use on LTE, I will manually change the permission so I can use it on the cell network. Again, I'm in control. The N7 LTE switches seamlessly from WiFi to LTE for my Talkatone monitoring. I really like that.

So, the N7 2013 LTE can be trained to do VOIP/SIP calls using TalkaTone and perhaps other software. The calls have varying quality but are usable. There are settings to diddle with and the main problem is the

recipient can be subject to an "echo" that can sometimes be nasty. A slow WiFi link is the worse. Overall, I'm satisfied with teaching this "old dog" new tricks for occasional phone call use.

Now the last stable ROM that works well with the Deb/LTE N7 2013 and VOIP/SIP phone calling is 6.0.1 Marshmallow and that's what I'm running on it now. Flo is using Lineage but I'm not doing WiFi phone calls with it. I usually mess with

a new ROM with Flo and if I can get a "newer" ROM to work with it with TalkaTone, I'll jump and stick it into my Deb/LTE unit. The 7.1.2 kernels are not working with the VOIP/SIP app I like and

I think I'll give Resurrection Remix a shot. If it's not 7.1.2 I don't care a long as it has a bit more utility than 6.0.1. Oh, I forgot to say that even though voice calls on VOIP/SIP vary in quality, SMS messaging works perfectly fine. I will say I'm having fun here. Anyone already doing VOIP/SIP calls on the N7 2013 LTE speak up and chime in here! I'm sure others would like to hear about it! Best regards, Kurt