My ipad say no service in the top left hand corner, how can I get it to change

No service means that you have a cellular iPad without a cellular service.

You can go into the settings and turn off your cellular antenna, that should help.

Turn off Cellular Data.

Settings>Cellular Data>Off

Try going to settings. Tap Reset, tap reset network connection, wait until the apple goes restart your iPad,. Back to setting tap provider and put in your network password.

I have the same problem, but it has a service plan, what do I do?