[Nexus 6P Q&A, Help & Troubleshooting] mohawahba:
Thanks for exerting all kind of possible solutions . really appreciated ... I ll explain next everything ..

First of all I'm no verizon subscriber .. I just got the phone from ebay shipped to qatar .. that's all :) international buyer ..

well secondly, the service is activated. here is different than yours in activation process. Plus my sim card is working on all other devices, opo, op2, opx, mi redmi n2, moto g ...

I believe the problem remains in the piece I have now (nexus 6p) because im used to buy phones from the US and they work fine expect some missing LTE bands that does not really interfere with calling service.

If the EFS/IMEI is corrupt, will it register on the network normally? will data and text still work?

Band 7 dead means no text no data and surely no calls ... plus when I chose it, i always get called ended right after i press Dial a number

experience with other bands:

band USA: text and data working fine ... calls: when dialing, it keeps dialing until the network fails and returns again like reconnect (the bars disappear and return again) and when i hang up, it respond quickly and execute the action but on,

Band 6: text ok data ok , calls no .. but when dialing, it keeps dialing normally till it gives me (call ended ) and if I try to hang up after few seconds, it freezes the phone for like 10 seconds till it execute the action of hanging up ...

so the USA band is the most responsive band in terms of hanging up ..

when I dial *#4636 .... , and access phone information to change preferred network, it is usually set to LTE/CDMA/GSM (PRL) >> if i try to change it to LTE/GSM (PRL) because no CDMA here, it usually return to the default after restarting the phone .. it does not really change the network if, for example, I choose GSM only .. I still see LTE on the bar .. moreover, when i try to choose 2g from cellular networks from settings, it does not reflect and I still get LTE working .. weird ..

** in all cases, FYI, I always see the carrier name in the top left corner of the screen.

*228 does not work as Im not verizon .. plus any USSDs are not going through as it gives error "connection problem or invalid MMI code"

when I try to access caller ID, it gives error " network or SIM card error".

I tried to call the carrier but they could not do anything. I'm still expecting a call from their back office team who ( i assume ) has more experience :)

getting a new sim would not help because I have tried different active sims different numbers and I also tried the second carrier here in Qatar (vodafone) and the problem persist.

the fone never worked since i reached Qatar. It was not rooted. I only unlocked BL and flashed the first factory stock rom (fully including the radio), yet nothing :D

wait wait please don't lose hope :)

one friend here is also giving me ideas and solutions to get over my isssue, he suggested i flash chroma rom bcz it has more bands. I will flash it and give a feedback.

I really appreciate your efforts and also his efforts [MENTION=5621301]Soulfly3[/MENTION]

pardon me if I wrote too many things and for giving all my trials not in order :D

Thanks