I am buying a good condition N-Gage off my mate tomorrow, I have checked it and all is good, however I want to made sure I dont end up WSODing it... So, anyone god any tips (aside from the obvious dont put stuff in the memory) to avoid me screwing up my phone with the white screen of death?

I read about someone who saved ALL their stuff in the MMC but it still got the white screen because of some texts... Thats why I am really concerned.