questions for the experts in this area....i'll be in amsterdam & brussels for about a week each next month....i was looking for a sim that i can use with my iphone (unlocked)....what is most important to me is data use....i don't care what the calls & sms cost since i will rarely use that....but i will require data usage all the time....

i would prefer to get a different sim for both amsterdam & brussels since i don't want to deal with roaming charges....please let me know what my options are....thanks in advance....