The "DLNA GSM T1800 phone" is a fixed wireless desktop phone, more commonly referred to as the DLNA ZT1800. It is a landline-style device that uses a mobile phone SIM card for connectivity instead of a traditional telephone line. The "T1800" in the name likely refers to the GSM frequency it operates on.
Specifications
Key Features
Network: GSM: 850/900/1800/1900MHz (quad-band).
SIM support: Dual SIM, dual standby.
Design: Fixed wireless desktop phone with a landline-style handset and an external TNC antenna for better signal reception.
Display: 2.4-inch color or monochrome LCD.
Battery: Lithium-ion backup battery, allowing the phone to be used during a power outage. Capacity is typically around 800–1000 mAh.
Multimedia: FM radio and MP3 playback. Some models also include a slot for a TF (microSD) card to play music and save call recordings.