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I don't know why my phone includes crossing sign over signal when i made update version 7.1 .1 in my phone .If someone knows about the problem, please give me explain.
Hi @lynnlynn, welcome to our forum!
The "X" icon is there because your mobile data is turned off. If you turn it on the icon will be removed until you disable mobile data again, so there is nothing wrong with your device, this is how it looks like in Android 7 and 8! 
I hope that answers your question.