[Imaginos]

Obvious way is to complete any eligibility requirements you have with your carrier under your current contract.

Free upgrades though? Those are just things that happen due to shortfalls in supply for the most part. Reading the other threads here, you've no doubt found that Sprint was geing proactive in trying to rid themselves of some TP handsets; opting to replace them with other models vs continuing to support them. Your provider probably doesn't share that strategy though.