A multi-line phone operates in the same way as a regular phone, with the exception that it has been specifically built to accommodate two lines. This implies that two phones connected to the same telephone line may be able to simultaneously receive and make calls.

A dual SIM phone is a mobile phone, typically a smartphone, with the capacity to use two subscriber identity module (SIM) cards.

DECT stands for “Digital Enhanced Cordless Telecommunication“. It refers to a wireless communications technology standard for residential and office telephony. DECT phones are cordless phones that use this technology to provide clear call quality and excellent coverage compared to other wireless systems.

If you've got a multi-handset cordless phone setup, then you will only need a single base unit for all your handsets. This means that although every handset will ring and be able to make calls, only one base station is required to handle them all. One base station could also be used to charge each of the handsets.