The second part is just not true. MANY prepaid plans allow you to port. As for the first part, there are lots of very affordable prepaid plans. I like straighttalk - runs on AT&T's network and offers unlimited talk, text, and data for $45/month. $42 if you pay three months at a time. Post-paid can't touch that - and your wife would get data to boot. Even if you found a carrier where you couldn't port, you could always port the number to Google Voice and direct that to the phone.