Why is my phone not detecting network and its saying it has an invalid imei

[AC Question]

You insert a sim card and no network detected

 

[sydneycooper1979]

You should take this to your carrier and have them help you.

 

[B. Diddy]

Welcome to Android Central! An invalid IMEI can also mean that the phone was blacklisted, due to it being stolen or not paid for by the previous owner. Did you buy it new or used?