Ok here's the deal. I got my s3 and droped down to 2gb. (Which was fine) my sister has a stratosphere ( on the same account ) and she got it during a double data promo. So I'm wondering if I switch sim cards will I keep my same number on my s3 and just have 4gb of data or am I missing something? Its not a issue with her going to 2gb as she's lucky if she uses 100mb.