I replaced my iPhone 6 screen a week ago. Today I have no signal?

My phone worked fine after replacing my screen about a week ago. Today it lost all signal and only shows "searching". I'm unsure if they re related, but I've done a network reset, soft, and hard reset, and yes. I tried turning it to airplane mode. No joy

Have you checked with your network to see if there are any problems in your area?

If you're sure that the network is fine then either a new fault has occurred to the phone, or there was more damage than just a broken screen, or you failed to properly reconnect an internal connection when you replaced the screen.

The last one is the most likely cause, and it's the only one you're likely to be able to fix.

One other possibility is that you fractured a conductor strip on one of the ribbon cables. If so then you may need another replacement screen.