I have an AT&T iPhone 4 and will be in Guatemala for a couple weeks without wi-fi access for days at a time. I really want the ability to have data access for important e-mails but don't want to pay AT&T $60 for only 50MB and the possibility of going over.

I've considered the option of unlocking my phone for the trip ... is there a way I can get pre-paid data in Guatemala with one of the native providers (I see Tigo as an option)?

I wouldn't even mind having a laptop option if that's the case (I see something about a USB dongle...) but would really prefer an iPhone option.

Thanks!