I have an iPhone 4S on Verizon. I have switched upgrades with other family members on my plan, and long story short I won't be able to get an upgrade until June 29th, 2015 :/. How can I sign up for Verizon Edge (once its out) so I am able to get the newest smartphone? Can I just sign up whenever, or do I have to wait until my two year contract is done /:? thanks