4s Sprint - Siri cannot make any phone call

just got 4s today, playing around siri. asked "call grandma on mobile" , showed "calling grandma's mobile phone: xxx-xxx-xxxx" , stayed there forever. fone not freeze not make call.
knows fix this? !

 

i have exact same problem. saw after says "calling xxxx, mobile 12345565..." 1 sec later loading circle @ top left corner stop spinning... , everything's stopped there , call didn't make through.

advice appreciated. thanks!!

 

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