I am selling my iPhone 5s on Craigslist now that I got my 6Plus. I have a possible buyer but they are asking me to email them certain info. By hey say, "Also can you tell me the ESN/MEID. I'm buying this to use on TING's network and I just want to make sure it will work for them.". Is this safe to provide them? This is the first iphone I have sold on Craigslist.