You can buy a brand new phone with 100 pesos of talk/text time for 300-500 pesos. You just need to show your passport and should have the phone and a DR number within 5 minutes. Go to any Claro or Orange store, there are many in just about every town. Calls to the US are around 6-8 pesos a minute and I think outgoing texts are 1 or 2 pesos. Incoming calls and texts are free. If your phone is already unlocked, you can just get the sim card...if you're on a GSM system (AT&T or TMobile, etc., but NOT Verizon or Sprint). I believe AT&T and TMoblie will unlock your phone for free if you've had an account over 6 or 12 months...they give you a code over the phone...