How do I use a showroom model of an iPhone 4S?
Solution 1:
I would suggest doing a DFU restore. You can do this by:
- Plug your iPhone into a computer running the latest version of iTunes.
- Hold the home button and the sleep/wake button for exactly 8 seconds.
- After this 8 seconds is up, release the sleep/wake button, but continue to hold the home button until iTunes recognizes your iPhone.
- Then, choose the Restore option (this should be the only option) and wait for iTunes to download the necessary software and restore your iPhone.