A friend whose contract expired gifted me his samsung sgh-i917 running windows phone 7.5. I am able to use it only w/ wifi which is fine with me. My question is can I somehow use the messaging on this phone w/ wifi? if I try to send a message it comes back with SIM card not found. I'm getting these messages from an email account however- it might have something to do with my phone being "synced" to my hotmail account, but I don't know how this person is sending me text messages tho.