calls do not enter to the Smartphone

danielmydanielmy Level 1
edited September 2020 in ZenFone Max Series
ZF Model: ZC520KL
Firmware/APP Version: WW_15.2016.19.01.506
Frequency of Occurrence: 50%
Rooted: No
APP Name:

In many occasions the calls do not enter to the Smartphone, in spite of having all the signal


  • Hi daniel12 ,

    Good day.
    Have you checked this matter with another different operator SIM card?
    Please kindly help me disable SIM and enable again.
    I would also suggest you can update the firmware to the latest WW-15.2016.1903.511 for a check.
    (settings> system > system update)

    If this problem still appears, please kindly try to backup phone files and factory reset.
    Sorry for any inconvenience.
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