How to slove the background downloading not working problem? - Xiaomi, Samsung,Huawei

1. Go to your phone settings and look for Permissions, then tap on Autostart


"For Mi 4:
Go to Permissions (or Security) > Auto-start > Enable HappyMod"


2. Close battery optimization.
"For Mi 4i:
Go to Phone Settings:
Additional Settings
Battery
Manage apps battery usage
Choose apps > HappyMod
Custom and in Background Network, choose to stay connected."

"Alternative solution:
Phone settings
Permissions (or Security)
Truecaller
Allow all permissions.
After that, go to additional settings > battery > manage apps battery usage, by default its ""standard"" make sure to keep it off."

"Steps for Android 9 and above:
Open your phone settings
Device care
App power management
Apps that won't be put to sleep
Add HappyMod to this list"

Navigate to your phone settings
Apps & Notifications
Apps
HappyMod
Battery
Launch > Disable Manage automatically - see picture below