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[b][b]Hello, Good evening, I am Brazilian, I need help, I'm with signal problems on my smartphone, Lenovo S8 +, sometimes gets signal and time is no signal, or emergency call, could you help me?
Thank you[/b][/b]

Thank you for providing the pic

Switch to 2G. You can do this *Settings - More - Mobile networks - 3G service - Network mode.

If it's on 3g only, switch it to 2g/3g or 2g only. Let us know if that works for you. If you don't see the option there, or it doesnt fix the problem, use this app:

[Only registered and activated users can see links Click here to register]

Hello Friend, same thing yet.

Can anyone help me?