My 5s running on 8.4 keep searching for the service provider, why?

[iMore Question]

My 5s running on 8.4 keep searching for the service provider.

I have try
1. Reset Network
2. Reset ALL Settings
3. Use my SIM into other phone, other 5s and Samsung Note 4 and both showed that I can make call which mean my SIM is OK
4. Inserted other SIM into my phone, and showed Searching.

Please help. I'm expecting calls ;(

 

[kch50428]

Re: My 5s running on 8.4 keep searching for the service provider.

Could be a hardware failure... if still under warranty, take to an AppleStore Genius Bar... if you have AppleCare+ - use it... of you have other insurance/extended warranty from another provider - use it...