Operating system name and version: Ubuntu 16.04.1 / Kernel version: Linux 4.4.0-36-generic #55-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux
Version of smsd: 3.1.15-1.2
Smsd installed from: package repository
Name and model of a modem: Future Technology Devices International, Ltd FT4232H Quad HS USB-UART/FIFO IC (with sierra wavecom Q24Plus modules)
Interface: USB

Is it possible to figure it out why modem is giving ERROR?

Hidden private text.

I find the problem at the Operator. Somehow GMS line blocked.