Purchased new s4 about 6 weeks ago, everything worked fine. Now if the phone is on & a call is received & rolls to vmail, the call is saved in vmail if the phone is OFF! If the phone is on, caller receives a message asking them to try the # again. In other words, caller CANNOT leave a vmail if the phone is ON. This has stumped Cricket support & local Cricket dealer. Any suggestions on how to get vmail working again? Thanks.