My new iphone 4s is displaying no service?

My new iphone 4s is displaying no service?

This happened to me a couple of months ago. Go to your cellular provider and have them replace the sim card. For some reason my sim card did not work but my phone thought it did.

Mine keeps doing that turn aeroplane mode on then off

Sounds like the SIM isn't activated.

Did you order it online or over the phone and it arrived in the post? If so, you need to call the network to tell them you've received it so they can activate the SIM. This is a security feature and stops someone using it in case it went missing in the post.

If you got it in a store they should have activated it in the store for you so it should be live within 2 - 24 hours of you taking it home.

Connect it to iTunes to activate the phone, make sure the SIM is in correctly and perform a hard reboot on an iPhone by holding down the home button and the top 'lock' button at the same time for about 20 seconds until you see an Apple logo on the screen, then release the buttons.
This reboots the phones software without deleting any data or settings.

If you still have nothing, call your networks customer services from another phone.

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