Quectel EG25 Modem SMS Software Improvement

I require the expertise of an engineer well-versed with the Quectel EG25 modem to refine my current software. Here is a summary of my project: - Previous Experience: Since I previously developed software for sending SMSs using a Quectel EG25 modem, I need someone comfortable with working on pre-existing systems. - Problem: current challenge is that it is experiencing difficulties when sending SMSs. An error, termed "+CMS error: unknown error", frequently occurs in QNavigator. - Improvement Needed: The successful bidder will need to diagnose this error and provide an innovative solution that will ensure smoother and more efficient SMS transmission. Ideal skills and experience: - Quectel EG25 Modem Experience - Expertise in SMS relay software systems - Proficient in troubleshooting - Familiar with QNavigator. screenshot attached to the error