I have an iPhone 7. I changed to a 4G plan and so I was sent a new sim, and so I changed my sims over and activated it, and now everytime i turn on my phone after it has been turned off it asks me to unlock the sim again.
Any ideas to stop this happening ?
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Go to Settings > Phone > SIM PIN > Turn it off or on.
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The new 4G SIM cards have the pin number automatically active on there for security reasons, however @AlexKid is spot on, so if you follow his instruction you can manage this from your phone.
Unless you changed it the default sim lock pin is 7890