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: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
A:AnswerIt is digital.
DECT 6.0 stands for "Digital Enhanced Cordless Telecommunications", which is a Digital Technology that ensures interference-free and secure calls with clear sound quality.