Resetting the network settings on your phone can resolve network connection problems.
Note: This will delete all network settings, including saved Wi-Fi networks and Bluetooth connections. It will not delete any apps, data, or contacts.
From the home screen, swipe the arrow symbol up.
Tap Settings.
Tap Dual SIM & Mobile Network.
Tap a SIM card, in this case, SIM1.
Tap Access Point Name.
Tap Reset.
Tap Reset Access Points.
The network settings have been reset.