Use for Original iPhone
I bought an iPhone 4 and now have an original iPhone gathering dust.
A friend is thinking of getting an iPod Touch and using Skype or some other VOIP system and giving up her cell phone. She has a fear of cellular radiation and she's looking to cut her phone bill.
I offered her my original iPhone to give it a try. Personally I don't think skype alone on an iPod Touch will satisfy her phone needs, and trying it out on my old iPhone would prove/disprove my theory.
What if anything do I need to do to make the old iPhone useable for her? Do I pull the chip out or leave it in?
What's the latest iOS the original iPhone can use?