I know this may seem like a stupid question but when I upgrade/buy a new phone and activate it on my existing metropcs account using the upgrade feature on metro's website, would I be able to to keep my current phone number that I already have from them? I know in a few month's that they will most likely be selling GSM phones and I just got my spirit two months ago, so when its time to upgrade, I will buy a phone from them online and upgrade it online under my account.