Resolved question: App won't open

by ruysnr - 4/15/12 5:52 PM

Iphone 3gs with iOS 3.x

I haven't update iOS since I got my iphone but i did jailbreak an year ago with "Spirit"

1> recently my iphone battery ran out of battery completely. After I recharge the battery, several problems start. I can't open many app (many of them download from apple itune store). And I can't get the time and date update with T-mobile.
2. New iOS keeps getting updated. I hear newer iOS require more powerful hardware to run them smoothly. Do I have to keep updating my iphone 3gs with latest iOS? Will it slow down my phone if I update?

Thanks for any input or answer