so you have TMO very good b/c they give out unlock codes for their fones. be patient and you'll learn something new.
here's what you do, two options
1 call TMO on the fone and ask the customer service ppl for the unlock code to your fone. make sure before you call to get your IMEI from your fone. it can be done pressing *#06#. just tell them that you'll be in central america for three wks and want prepaid service while you're there if they ask.
or
2.
http://voicestream.custhelp.com/cgi-bin/voicestream.cfg/php/enduser/ask.php use that link to email them and request your unlock code from TMO. topic "phone" then "phone troubleshooting."
now if you noticed behind your batt there's your SIM crd. that has all your info pertaining to TMO and your acct with them. when you get to DR and they activate you they give you an
www.orange.com.do SIM crd. so you take TMO SIM out and pop the orange SIM in. remember to purchase the RD$275 card when you activate you orange number. DON'T LOSE YOUR TMO SIM!
now MAKE sure to read the owner's manual about copying your phonebook to your TMO sim card so you don't lose your phonebook numbers. i can help you with that if you like, very easy to do...i had the same fone .