Help Have to dial number twice to make a call

[rainbug]

I just got this phone a couple days ago and at first calling someone worked fine, but now when I try to call someone I get an automated message asking me to redial the ten digit number I'm trying to call. At first I thought it was just their phone, but it does it for any call I make. I don't know if I accidentally changed a setting or something, but I can't figure out how to change it back. Anyone know how to fix this? Thanks.