WiFi Calls Using UMA?

i have virtually no att cell signal in office (where i'm @ day) , wondering if it's possible make wifi calls.

 

i haven't seen service at&t or option in iphone enable wifi calling. there may methods through jailbreaking thought don't jb don't know.

maybe skype app runs calls through wifi? or maybe other app might that.

else chime in help.

 

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