Unlock with iTunes Logo
1. Useing other carrier sim card to unlock the phone like(AT&T T-mobile sim card ), when your phone unlocked than use your personal sim card
2. Update ios system
3. Factory reset
1.Metro PCS Users Need to Call the Customer Service line 888-863-8768 to talk to someone. Update the new iphone IMEI Number.
2.IMEI number blacklist check.if the phone blacklisted will no service like below.
Swappa ESN Check https://swappa.com/esn
T-mobile IMEI Check https://www.t-mobile.com/verifyIMEI.aspx
AT&T IMEI Check https://m.att.com/shopmobile/wireless/byop/checkIMEI.html
NO MMS Message