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How i improve my phone it says invalid SIM after i reboot

can you give us more details? what happened? is this a new phone? did you get a new sim card? who is your carrier?

just remember the more details you give us the better we can help.
 
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1: Restart Your Android Phone
2: Check SIM Card Tray
3: Insert Valid SIM Card
4: Toggle Airplane Mode
5: Reinsert SIM Card
6: Select Correct Network Operator
7: Buy A New SIM Card
8: Set Network Mode to Auto
9: Clear Cache To Fix Invalid SIM Card Error
10: Use Phone In Safe Mode
11: Do Factory Reset Of Your Android Phone
Try from 1 to 11
 
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