It's a mobile phone  

A mobile phone is handy - when it's in the same handset

With a Dolphin handset, you can switch from two-way radio to mobile telephony at the touch of a button. This gives you the freedom to choose which mode is most appropriate for the call or the circumstance. And of course there's no need to carry two different bits of kit.

Call Manager
With Call Manager voice messaging, you can be sure that important messages will reach you. Call Manager combines a personal answering service with a call diversion facility. So callers only need one number to reach you.

If you are not available on one number, Call Manager automatically dials a second, predefined number of your choice. And if you are still not able to answer, Call Manager prompts your caller to leave a message.

Once you've listened to the message, you can ring the caller at the touch of a button - avoiding the need to remember or dial their phone number.