Page Comparison

+CMS ERROR: 500 (unknown error)

1. the modem is not registered on the network.

2. not enough funds to send a message.

3. network is experiencing overload and cannot send a message at the moment.

4. incorrect service center number or subscriber number set.

5. Antenna cable is bent.

1. Check modem signal level.

2. Check antenna cable is connected inside the unit and outside the unit.

3. Check service center number is written correctly.

4. Setup manually the SMS Center number.

5. Try another SIM card

+CMS ERROR: (Unassigned (unallocated) number

Destination requested by the modem (SMS) cannot be reached because, although the number is in a valid format, it is not currently assigned. E.g. the number does not exist or the number is not operational.

• Check the phone number.

• Check the facility on the receiving side.

GSM modem: Error, check your SIM card and PIN code

No SIM card is installed. Wrong PIN.

• Check the position of the SIM card in the holder.

• Check the PIN settings.

+CMS ERROR: 97 (Message type non-existent or not implemented)

+CMS ERROR: 69 (Requested facility not implemented)

• Usually this means an error in the number of the SMS center

• Make sure you type the phone number correctly as described in Notifications via SMS

+CMS ERROR:29 (facility rejected)

The service requested by the modem is not supported by the mobile network.

• Check if the “SMS center number“ is written correctly.

• Write the SMS center number manually (Main menu >> SMS messages >> SMS center number).

Setting up GSM modem

• Try to use another SIM card.

• Try the card from another working modem.

• Try sending a message to this modem.

‘+CMS ERROR: 8’ - Operator determined barring

Operator has blocked the SMS. The cause is unknown.

1. Try to register the device using IMEI number.

2. Try entering the manual SMS center number, it is sometimes not automatically defined.

3. Contact the operator and ask why.

LTE service: connection cannot be established

After 5 attempts, the system failed to connect to the specified APN.

Check the LTE settings and GSM network.

Update the firmware to the latest version.

'+CMS ERROR: 2172' - State not allowed

1. The signal is weak, which will cause this error to be reported.

2. SIM card does not support equipment (2G for VT700 modem) and unable to communicate with the operator.

2. The SIM card does not support 2G. Use a SIM card with a different tarriff.

‘+CMS ERROR: 2174’ - SMS sending failed

1. Antenna cable may have disconnected from the modem due to transportation.

2. SMS center number is not autodetected.

1. Open the metal case and reconnect the SMA cable from antenna to the modem, make sure you connect it to the correct plug.

2. Write the SMS center number manually (Main menu >> SMS messages >> SMS center number). Setting up GSM modem

Repeating every few hours:

LTE service: connection failed

LTE service: connection established

LTE service: connection failed

LTE service: connection established

Perhaps the provider disables inactivity connection, or makes a sanitary reset every few hours.

This is a common practice among providers, nothing can be done here. The connection is restored automatically after the session is closed.