How to set the data connection to always active

ZF Model: ZB570TL
RAM: 4G
Firmware/APP Version: Android 7.0
Frequency of Occurrence: -
Rooted: No
APP Name: -
How to set the data connection to always active? I am not receiving push notifications when the phone is on sleep or the screen is off.
RAM: 4G
Firmware/APP Version: Android 7.0
Frequency of Occurrence: -
Rooted: No
APP Name: -
How to set the data connection to always active? I am not receiving push notifications when the phone is on sleep or the screen is off.
0
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Good day
What's your phone’s firmware version (Settings > About > Software information > Build number)
Do you mean internet stop in standby mode?
Does it happen every time or sometimes?
Please help to confirm, thank you:)