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Could be due to inactive service, blocked SIM card, or incorrect network mode settings. Confirm active service with the carrier, check if the SIM card is blocked or damaged, and ensure correct network mode is selected in device settings.

Poor call quality can be due to low signal strength, interference, or network congestion. Improve the situation by moving to a location with better signal, minimizing interference, or making calls during less busy hours.

Possible causes include network congestion, signal interference, or transitioning between cell towers. To troubleshoot, try making calls at different times, clear the surroundings from potential sources of interference, and if in a moving vehicle, consider network transition issues.

Issues encountered may be an unsupported area, outdated device software, or incorrect APN settings. Verify network coverage, update device software, and check the APN settings for accuracy.

The problem can be due to the device being in airplane mode, outdated software, or SIM card issues. Ensure airplane mode is off, update the device's software, and check the SIM card for proper insertion or damage.

Possible issues include service outage, full message memory, or incorrect Message Centre Number. Clear the message memory, check for any carrier service outage, or verify the Message Centre Number in the device settings.

Caused by network instability, poor signal strength, or hardware issues. To resolve, try reconnecting to the network manually, restart the device, or check for any hardware issues that might affect reception.

This can occur if the SIM card is not properly inserted, is dirty, or incompatible with the device. Ensure the SIM card is correctly placed, clean the SIM card contacts, and check for compatibility with the device.

Issues may include incorrect Wi-Fi password, router problems, or device's Wi-Fi adapter issues. Check the password, reboot the router, or troubleshoot the Wi-Fi adapter to resolve.

Problems with roaming can stem from an inactive roaming service, device setting errors, or a lapsed plan. Confirm roaming service activation with the carrier, check device settings for roaming, and ensure the plan supports roaming and hasn't expired.

This is typically due to roaming issues or incorrect network selection. Reactivate roaming with the service provider and manually select the network or set the device to automatically select a network.

May be due to network congestion, outdated network settings, or data throttling. To improve speeds, avoid peak hours, update the device's network settings, or check the data plan to ensure it hasn't been throttled.

Potential causes could be background apps, automatic updates, or streaming services. To reduce usage, restrict background data for certain apps, disable automatic app updates, or limit high-bandwidth activities like video streaming.

Errors may be due to an invalid SIM card, carrier restrictions, or deactivation. Verify the validity of the SIM card with the carrier, confirm if there are any restrictions, and make sure the SIM hasn't been deactivated.