I just bought an iPhone 3GS yesterday and it was with Fido, I went and paid someone to Jailbreak/unlock it so I could use it for Rogers. I went to Rogers today to get a new SIM card for it and when I put it in everything worked except Safari and the mail app. I went to work and my mom tried to fix it by googling the problem and the instructions to fix it were "delete Cydia, and delete the Safari download manager" she continued to delete Cydia, and then couldnt find "Safari download manager" (I can't either, and I have had multiple iPhones and never heard of it.)
I got home and she told me what she'd done and that she reset the phone through settings after deleting Cydia didn't work.
How do I get Safari and Mail to work? They will open then close right away.
Also how do I get Cydia back?