Does the GD-48 support remote access or mobile app connectivity?
Yes, the GD-48 supports remote servicing and is compatible with a mobile app. It also has built-in RS232 and integrated PSTN (V22) communication, and optionally supports Ethernet, GSM/GPRS, and ISDN modules. (Page 6)
From the official Honeywell GD-48 Security System Control Panel manual, page 6
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