iphone 4s dropping service/no sims message

[bluegunderson]

Five times today, so far, my phone has dropped service/given me a sims failure message. Why? And how do I put a stop to this nonsense?

 

[Semel]

Have you tried to reset all network settings?

 

[bluegunderson]

No, how do I do that?

 

[KevinJS31]

Settings/General/Reset/Reset Network Settings

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