[Activities]ask my phone cannot switch to 4g

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2017-03-20 15:03

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hello i just want to ask something, my problem is,before i try tutorial the LTE signal is appear but unstable then i try to lock signal by  type *#*#3646633#*#* on my dial. but after that no bar signal LTE appear. i try too switch on setting menu but now my LTE signal disapperar. how i it could be possible? any advice? . thanks

device info : meizu m3 note