Rokit IO Pro 3D Manual page 127

Basic Troubleshooting
If you find exceptions when operating the mobile phone, restore the factory settings and then refer to the following table to solve the problem.
If the problem persists, contact the distributor or service provider.
Fault Cause
The SIM card is damaged.
SIM card error The SIM card is not in position.
The metal face of the SIM card is polluted.
Signals are obstructed. For instance, radio
waves cannot be effectively transmitted
Poor received signal
nearby a high building or in a basement.
quality
Line congestions occur when you use the
mobile phone in high-traffic hours
Solution
Contact your network service provider
Check the SIM card
Clean the SIM card with a clean cloth
Move to a place where signals can be effectively transmitted
Avoid using the mobile phone in high-traffic hours
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