yeah use your own unlocked GSM phone.....to see if it is unlocked.....
put in an alien sim(one that the phone isn't for) and if it ask for a code......the phone is locked....no code request and phone is unlocked
if it AT&T you can get the unlock code for free online in about 2-4 days......google it
if you need an unlock code for Tmobile, Cricket or Metro PCS.....you can get dem on Ebay for cheap money($1 -$5) unless it's Samsung or Nokia..
Flow has sims for $300J's and Digicel is $588J's......Flow has cheaper rates but Digicel user will hate you as it eats up all der credits.....
you can buy phones too in Negril......plenty of places has dem for sale....Flow runs specials sometimes on dem keypad phones for cheap money....
Cool Runnings, Marko