My Sprint phone has an internal electrical problem... how do I...

[samoth]

How do I go about fixing it? I'm taking it in today, but I don't (read: can't afford) to have them charge me a hundred dollars and me be without a phone for a week.

Anyone else have similar experiences with malfunctioning Sprint phones? It's a newer model flip phone that cost $300 (well, $200 with the renewed contract).

Thanks for any help.