My girlfriend and I are driving up to Montreal on April 21st for a five day vacation. We both have iPhone 4's which are not jailbroken and are locked to AT&T. I also have a 2G iPhone which is jailbroken and unlocked. From those of you who have been to Canada, which of two scenario's below do you think would work best. I don't plan on sending any texts while I'm there. I'll make an ocassional phone call home (Skype?), but that's about it. However, I would like to use my phone for Twitter, Facebook, Yelp, Zagat, etc. 1. Use the iPhone 4 until we get into Canada. I would then put the phone in airplane mode and use it to pick up wifi hotspots. The hotel we are staying at has free wifi, so I know I will at least have data at the hotel. 2. Use my unlocked 2G iPhone and purchase a pre-paid SIM card when we're in Montreal. I'm only familiar with Rogers up in Canada, so I don't know what my other carrier options would be. I'm just seeing what the best option for me would be since I don't want to receive an enormous bill from AT&T upon my return to the states.