Why won't my Samsung Galaxy S4 make or receive calls?

[AC Question]

samsung galaxy s4 wont make or receive calls

samsung galaxy s4 wont make or receive calls

 

[spagman]

Re: samsung galaxy s4 wont make or receive calls

This could be a long list of things....

Service provider, sim card, sim card reader, apn, blacklisted imei, missing baseband... Firmware.. Baseband IC chip.

Can you be more specific?

Like S4 model...
Service provider...
What you were doing when you lost service.. Etc.