[Sprint  Galaxy Note 4 Q&A, Help & Troubleshooting] zeptonium:
I recently moved and there is no sprint service at my new house. I am trying to switch 3 numbers from sprint to at&t. I full purchased my sprint note 4 two years ago and my 2 year contract is up. I paid off all outstanding balances on my account. After talking to sprint they said the phone was too old to DSU and gave me my MSL, which I have read does me no good. They told me my phone would not work with att but I have read multiple people on here have been able to use the sprint note 4 on a GSM network such as att.

So I went to an att store and they put a activated att SIM in my phone. It made calls and had 3g data. I understand I will not get LTE on this phone from att. So then I ported my number over and got a new att SIM card, put it in and I had service and data - even though I had an "Invalid SIM card" message. att guy said this was normal. Ran 2 speed tests and got 0.15 down / 0.79 up and 0.30 down / 1.11 up. att guy said if I did a system update I might get better speeds. Didn't bother me though cause it was already better than sprints speeds in the area on LTE. I could get a web site to load in a few seconds instead of 1-2 minutes.

About 15-20 minutes later I did the same process on my moms phone a sprint galaxy s5 (this was the main number from the sprint account). We did the same test beforehand with an att SIM - both phone and 3g data worked. There was a problem at first and the guy said "it was added to the wrong band" but after he called someone and tried again he said it was fixed. After porting that number and inserting new att SIM it had no phone service or data. Also my note 4 that was working before has no phone service or data. When I try to make a call it gives me some message about connecting to a sprint operator to use a prepaid card or make a call with credit card. Also the S5 should be on the newest software update cause my mom installs it as soon as it pops onto her phone.

The att guy said it seemed like sprint re-locked these 2 phones and didn't know what to do because they were previously working on the att network. He suggested I call sprint which I did and after 3 different technicians and 45 minutes later they hung up up on me. The only question they asked me was for my DEC #. I tried calling back and told them I was hung up on, they put me on with another technician and after 20 minutes on hold they hung up again. I am going to keep trying to get someone at sprint to help fix this but it doesn't seem like I can get anyone competent to help me.

The att guy was trying his best to help, even driving to another location to pick up 2 temporary phones for tonight 45 minutes after he was supposed to close. We got our numbers put on the temp phones for the night and finally the att guy was able to go home 90 minutes after the store was supposed to close.

I was planning on trying out some new roms on my note 4, which is currently stock (I've never got a popup to install new update and never did it manually). I haven't played around with any custom roms since my last phone 2 years ago so I'm pretty rusty although I have customized all my other phones for the last 4-5 years. I also plan to switch to a galaxy s8 when it comes out.

Is there anything I can do to my phone before I go back to att tomorrow? I just backed up my game apps with helium/carbon. I'm overly tired so before I mess up my phone I'm going to get some sleep and get a fresh start in the morning. Then I'm going to install twrp and do a full backup. I was also planning on following this thread https://xdaforums.com/galaxy-s5/general/how-to-add-rf-lte-frequency-bands-to-t2886059 to add the att GSM bands. Will doing this https://xdaforums.com/note-4-sprint/general/sprint-users-easy-downgrade-to-kitkat-t3471131 help at all?

[IMG="system info"]http://i.imgur.com/XK5f3n9.jpg[/IMG] [IMG="system info"]http://i.imgur.com/7GFgdDD.jpg[/IMG]

Any suggestions are greatly appreciated. Thank you in advance.