So, recently my phone was stepped on and I want to buy a new phone. I want to get a G1 off of Craigslist, but it wouldn't be worth it without the data plan. But the data plan is too expensive. So I was talking to my friend who has the data plan on his G1 and he said he could put his sim card into my phone, then take it out and put my sim card back in and I would have to data plan. Is this true, and how does it work? Thank you so much. :]