How to Test if Inabililty to make calls is hardware or sofware

I live in Belize and bought a Sprint "bad esn" note 2 on ebay.

The phone was "unlocked" for the local cdma network by the local cell phone company, and worked perfectly for about a month.

Then one day I took the phone out of my belt case to make a call and the phone was dead, and I mean DEAD.

No battery indicator lights, NOTHING. And it stayed dead. It would not power up no matter what I tried to do.... hard reset, soft reset, take out battery etc etc etc.

After a few days I got an idea to hold the power button down while I connected it to the charger to "jolt" it back to life, and guess what.... IT WORKED!!!!

My previously "dead" phone powered back up and seemed to be working normally, wifi was working fine and the cdma network was showing all bars.

But, it would not connect when trying to make a call.

The phone shows like it is calling, but there is no noise or message from the carrier or ANYTHING. Also cannot send texts.

The local network company tried to re unlock it but to no avail, still cannot make calls. They couldn't tell me whether it was software or hardware related either.

So, what can I do to troubleshoot the problem?

Is it possible when I "jolted" it back to life something on the motherboard got fried?

Should I try to "flash" it to another carrier in case a Sprint firmware update is causing the problem? (the bad esn status?)

I've rooted the phone and flashed several previous modem firmwares and non of them fixed the problem either. (haven't tried flashing a whole new different rom, though)

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