I have been scouring the App store to find a reliable texting app that my girlfriend and I can use (both iPhone owners). I have looked at Unlimited SMS 2.0 and TextFree Unlimited, but I was wondering if there were any other texting apps that I should look at? I currently have the $15/month for 1,500 texts with AT&T, but looking at my monthly useage, I really only send/receive 5-600 text/month, and most of them are to my girlfriend. I should also note that neither of our iPhone's are unlocked or jailbroken. Thanks.