That is something you can't do on your iPhone, but if you have a Mac, you can use the iMovie software on the Mac to delete audio. There might be an iMovie app on the app store, but I am not completely sure if you can delete audio from that. The Mac iMovie software on your Mac might not work either to delete your audio but you can always try
The iPhone 4 camera has a 5-megapixel camera. The camera also has HD (720p) video recording for up to 30 frames per second with audio.
No
It shouldn't because all your doing is turning it on and off
Yes you can. The iPhone 4S has an inbuilt video camera an you can choose to film your project in high definition.
Yes
yes it is possible
If both phones can support Skype, which the iPhone does.
yes. Thats what facetime is for.
All you have todo is attach the iPhone to your computer insure iTunes is open and then select restore to factory settings options, which will reset the handset and erase ALL previous data.
I'm not sure you can veido text on any phone
The iPhone 4s is the 5th iPhone that Apple has made.
iphone 4s