H there, I do not know if this post is in the appropriate section but it's defintely worth noticing.
It may be related to my carrier only , but if I select the option "Show my caller ID" to NO , my phone stops making calls : as soon as I dial the number and hit the call button the conversation is ended.
As soon as I put the option back to YES , everything works fine.

16GB 3G locked to Claro Honduras

Pakal

That is carrier related. Some carriers won't work when you try not sending your ID.

Have fun