My Samsung Solstice f'd up and keeps rebooting over and over. The only way to stop it is to take out the battery. I can get to the internals with TkFileExplorer_2.2 so if anyone has any advice if I can fix it with this method let me know. There doesn't seem to be a firmware flash anywhere online for the solstice.

Otherwise..
I still have an unlocked phone that I used previously to the solstice. Can I just put my Sim card in that old phone and it will work? All support is closed now so I am pretty much screwed until Monday.
Thanks guys.