Just to add, as far as the Unlocking of the device Sim/Network, if it pertains to an older model phone, I have found that you can contact Sprint through their online chat and the I got the unlock information in a matter of 10 mins. As well, through AT&T there is an online form to fill out, quoted 5-7 days, but received my email in only a few hours. As long as it's not the newest device, they will honor the unlock. Cheers