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Root [Sprint] Unlock/network problems

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Dbaydroid

Lurker
Hi, bought this SPH-L720 and after my regular unlock sources couldn't unlock it I decided to try for myself. Tried a procedure on Galaxys4root that supposedly unlocks it for non-US carriers and tried my Jamaican sim. it did remove the 'invalid sim' message, now all I see is a red 'x' at the network signal bar.

Current status: V4.4.2. Bld# L720VPUFNG2.

History of what I did... Rooted, Downgrade base band to MDC, still showed V4.4.2, followed the entire procedure and got to the state of no signal but with invalid sim gone. Next I did the edit for APN settings, still nothing. Not sure what I did after that but I took a break and when i came back in the evening it was saying "Firmware upgrade encountered an issue, please select recovery mode in Kies and try again". Try as I might, Kies wouldn't connect so I got a stock 4.4.2 here (thanx) and flashed it with Odin3 v1.85 and voila ! Back to square one ! 1.5 actually because I still get that red X beside the antenna sig. None of the network settings yield anything, GSM/UMTS etc. Phone is also unrooted now.
What I need: Help to get it unlock and fully operational, I'll root/upgrade as high as I can (learning) so any help appreciated.
Pls excuse the long post but I wanted to list all that was done.
Thanks in advance.
 
Ok, so it seems it's definitely unlocked since i ran the procedure again but i just cant get any GSM signal although it accepts the sim card.
Finally got my MSL code after finding an APK file that i installed on my phone. I didnt have the MSL previously.

So now i need it unlocked for T-Mo, AT&T etc. or maybe i just need to adjust the APN settings. Tried that but no luck yet

EDIT: When i try to add T-Mobile apn manually with a Jamaican sim card in...i save and the T-Mo apn disappears with the refreshing of the screen, leaving my manually set Jamaican apn.

I then insert a T-Mo sim and it auto-finds and lists the T-Mobile apn three times but still nothing on the signal bar. What gives ?

Any help ?
 
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