Lost ability to access Google apps

Using an LG android phone, my family member moved to NE India.  They swapped SIM cards to a local network.  Since then everything works except for Google apps. They have followed most general instructions to reset phone, remove and reinstall all Google apps, etc.  Still unable to access Google apps.  Everything else works fine including hot spot, wifi, etc.  Can only communicate via email using phone as hotspot and laptop email.  Am searching for a solution.