Today I bought the blue s3 used from someone. Met at metro store, the rep checked the phone out said it was a real metro phone and it wasn't blacklisted or anything. The lady selling the phone had to call customer service to disconnect her line. Then the rep said she switched my line over and was showing on her end. But test calls wouldn't work and the lady's number was still showing up under phone info. The rep said its because it could take up to 2 hrs to register. So I left the metro store but my other f3 was still connected. I called metro and spoke to a rep and he said the line switch had failed. We kept trying to get it to work and he basically said the phone was broken. I argued with him, and he had me switch my Sim card from my f3 to the s3 and it eventually worked. I never had a issue switching lines before. But now my husband wants to upgrade from his admire to my old f3 and it has no Sim. The rep said to use the Sim from the s3. But if it wouldn't work in the s3, why would it work in the f3? If it fails to work, will they sell a new Sim?