Looking at purchasing a 64g ipad 3g and found one at a good price. Person says it is a 64g and says "can have a 3g card put in it to have internet everywhere " I texted him and he says you can just put in your SIM card for 3g. Problem is I'm 1900 miles from where it is located, however my son is within 5 miles. Son knows nothing about ipads. Is there a quick and easy way to tell if 3g or wifi?