4s Sprint - Siri cannot make any phone call

[logan59102]

Just got my 4S today, playing around with SIri. So I asked her to "Call grandma on her mobile" and it showed up "Calling Grandma's mobile phone: xxx-xxx-xxxx" and it stayed there forever. The fone was not freeze but it could not make the call.
Anyone knows who to fix this? thanks !

 

[kicka]

i have the exact same problem. i just saw that after it says "calling XXXX, mobile 12345565..." then about 1 sec later the loading circle at the top left corner stop spinning... and everything's stopped there and the call didn't make through.

any advice will be much appreciated. thanks!!