A:AnswerBrooke - We apologize but the CS5119 is a single line telephone system. You might want to check models DS6151 or the DS6251 if you want a multi-line unit. Thank you for your interest! ~VTech Support
A:AnswerHi - The VTech CS5119-16 does not have a Bluetooth feature. If you wish to connect a landline phone to a cell phone, you can check the model IS8151-5.
Thank you,
-VTech Support
A:AnswerHi - The handset from the VTech CS5119-16 can be registered to the telephone base of the CS5129-26. You need to de-register the handset from the original base then re-register it to your current base. For more details, you can contact our Consumer Sales and Service Center between the hours of 9:00 AM and 4:00 PM Monday through Friday at 1-800-595-9511.
Thank you,
-VTech Support
A:AnswerHi - No, the VTech CS5119 will not work with Wi-Fi calling. The telephone system requires a landline service to function.
Thank you,
-VTech Support
A:AnswerNever paid too much attention since I knew I have two handsets, but I think the handsets keep a charge for at least 3 days but I'm usually not on the phone for extended periods of time.
A:AnswerHi - No, the VTech CS51119-16 does not have a sim slot. It requires connection to a an active landline service and AC outlet to function.
Thank you,
-VTech Support