So if I want to use the SIM card from my contract HTC One M8 for multiple phones to keep the same number. Would it be possible to do so without having to deal with Verizon? Also, as soon as I sign into Google, I'd have all my contacts right?
yes, you can swap them, as long as both phones use the same type of sim. just put the sim in whichever phone you want to use and go on about your business, when you're ready to switch back, just go for it. i've done it several times. no problems.