GSM Signal Monitor & SIM Card Info, developed by VMSoft, is a free Android application that monitors the strength of the phone's (or tablet's) signal and alerts the user when there is no GSM coverage or when the signal is weak. The app provides voice notifications, vibration, notification on the device screen, and plays a ringtone. Users can customize how they want to be notified in the app settings.

In addition, GSM Signal Monitor & SIM Card Info provides detailed information about the device SIM card, such as phone number, voice mail number, SIM Card Serial number (ICCID), Subscriber Id (IMSI), mobile operator info, and network type. This information can be easily shared by tapping on the share button or copied in the device clipboard.

The app logs every signal-related event in its notifications log, including when the GSM signal is lost, restored, or low, and when the mobile data is lost or roaming is active. Users can configure what's logged in settings, and the log can be exported in CSV, PDF, and HTML formats.

GSM Signal Monitor & SIM Card Info is not a signal booster app and can be downloaded from the Google Play Store for free. The app offers many configuration options, including notifications for low battery shutdown, day/night theme, and a great number of customization options.