@mahi: Can you try going to Settings > Connections > Mobile Networks, and make sure that the Network Mode for any connected SIMs is set to LTE/3G/2G (auto connect), as this will connect to the strongest available mobile data signal in your area. Please make sure that Wi-Fi is disabled when attempting the connection, to prevent any connectivity conflicts. If the issue persists, please reach out to your network to enquire about any restrictions to your account, or to the service in your area.
