if you top up your sim card on line with small dollar amounts every other month, say 200j, you will not need to get a new sim card when you arrive and you will have minutes on your phone to use from your top ups; saves you the hassle of new sim and then folks know your old number as well. International minutes in JA cost you perhaps $15 usd for 660 minutes talk time so that too is an excellent program for those needing to call back to home land; note however that these international minutes only last 30 days then they are gone so use or lose in 30 days unlike the local minute top ups which stay on the sim as long as you don't let the sim go dormant via passing on periodic top ups [I have been told every 60 days but we have gone 90 without issue].