Solutions for no carrier message | Multi-Tech Systems MTCBA-G-UF1

Chapter 3 – Troubleshooting

Situation B: The modem always returns «No carrier» when trying to issue a communication

Solutions for “no carrier” message

If the modem returns …	Then ask …	Action
no carrier	Is the selected	Type AT+CEER to view the extended
(esp. for data communication)	bearer type	error code (see “Error Results Codes"
	supported by the	in the AT Command guide).
	called party?	Be sure that the selected bearer type
	Is the selected	is supported by the called party.
	Is the selected	Be sure that the selected bearer type
	bearer type	is supported by the network.
	supported by the	If no success, try bearer selection
	network?	type: AT+CBST=0,0,3
		Be sure SIM card is available for
		data/fax calls.
no carrier		Be sure that the semicolon character
(esp. for voice communication)		(“;”) is typed immediately after the
		phone number in the AT command.
		E.g., ATD######; type
		AT+CBST=0,0,3
		Configure the SIM card for data/fax
		calls.
	Is the received	See “Verifying Signal Strength.”
	signal strong
	enough?
	Is the antenna	See “Antenna/RF Specifications.”
	properly
	connected?

Multi-Tech Systems, Inc. MultiModem® GPRS with USB User Guide

MTCBA-G-UF1, MTCBA-G-UF2 specifications

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In conclusion, the Multi-Tech Systems MTCBA-G-UF2 and MTCBA-G-UF1 are powerful solutions tailored for reliable and secure cellular connectivity. With their rich set of features, including dual SIM support, multi-protocol functionality, and secure data transmission, they are ideal choices for various IoT applications and industries requiring dependable communication solutions. These modems exemplify Multi-Tech's commitment to innovation and reliability in the ever-evolving world of connected devices.

Solutions for “no carrier” message

(esp. for data communication)

(esp. for voice communication)

MTCBA-G-UF1, MTCBA-G-UF2 specifications