The connection issues might be caused by using the IPv6 protocol. We kindly recommend you to change it to IPv4 or IPv4/IPv6.
Go Settings -> Connections -> Mobile networks -> Access Point Names. Select your mobile operator then scroll down to APN protocol and select it.
Then select IPv4 or IPv4/IPv6.
If you still experience any issues, please let us know on madfingergames.com/help, thank you.