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SOLUTION: Samsung Galaxy J7 Refine (SM-J737P) - Service Related SIM Failures
In some instances, users may notice their roaming service experience is not as good as other Sprint customers.
Additionally, users may report inability to recover service after performing a ##SCRTN# or a ##RTN# even after finishing normal triage steps.
These could both be related to the SIM in the handset not being able to connect to the server which allows for proper updates.
In cases where the SIM card is not able to reach the server or roaming service appears poor, please perform a SIM card replacement. The correct UICC should be SIMOLW406TQ with OI0002b printed on the actual card.