This VTech Connect to Cell DS6621-2 expandable cordless phone system features Bluetooth technology for wireless connectivity with compatible cell phones.
This VTech DS6621 says it is for use with cell phones, even perfect for cell-only families. Two problems. One, the answering machine in the base is designed to be used with landlines only, according to VTech technical service, and will not engage an incoming cell phone call under any circumstances -- including that cell-only family that does not have a landline to attach to the DS6621. The other, frequently the home base "un-pairs" itself with the cellphone. If you were not watching your cell phone when it happened, you would not know you are disconnected. Your cellphone would think it is still paired, and the base unit of the DS6621 still shows the cell line as active. Only when someone calls and you are with your cell phone and with the DS6621 base unit -- hearing one ring and the other one not ring -- would you know the DS6621 had unpaired you.