That is odd that it has the cross through it. Are you able to use mobile data when off wifi?
I have Verizon and have seen 1X, 3G and 4G but never 4G with a line through it. Check your settings under mobile data.
What does it look like when the WiFi is off?
That is the reason for the 4G sign with a slash through it. I currently have WiFi + 4G on. View attachment 177084
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