+1  A: 

Just tried it in an another app and it placed the call without asking me first. Guess you could file a bug report if Apple if you don't think it should behave this way (personally I'm OK with it).

bpapa
+5  A: 

Yes, in 3.1, the behavior of the tel: call changed back to the way it was in 2.x. AFAIK, 3.0 is the only version that asks the user for confirmation.

Ole Begemann