hello everyone! I'm thinking about picking up the 6 plus i currently have the 4s and it thankfully works fine with no bumps or scratches my question is, is it possible for me to be able to use both phones under the same sim card? I'm a civil engineer and it requires me sometimes to go out on contruction sites i would like to be able to use my 4s at work and when I'm home maybe swap out sim cards and use the 6plus. any info would help thanks!!