Says Searching for Service after screen replacement

[zq8 blazer]

I replaced the screen on my galaxy S6 and ever since it just says "searching for service". It recognizes that there's a SIM card present, but it won't connect to a network. Any ideas as to why this is?

 

[Rukbat]

The antenna isn't connected? (That little round thing on the end of a stiff wire.)

 

[zq8 blazer]

There are two stiff coax cables. Idk which one goes to the antenna.

 

[Rukbat]

The one with the little round connector with the wire sticking out the side. If they;'re both like that, there are two antenna connections, and each one should go to the one it falls closest to.

 

[zq8 blazer]

Ok, I didn't mess with either when replacing the screen. I went ahead and checked them though and they're making a good connection and are in good condition.

 

[zq8 blazer]

So I use AT&T and just noticed under mobile networks and network mode it only has LTE/CDMA and CDMA options. Could this be my problem?

 

[troyboytn]

Yes

 

[zq8 blazer]

What can I do to switch it to GSM?