Do I need one for each phone, or just one for the whole house?
1478140
You will need one for each phone connected to a phone line. I have a remote handset that isn't connected to the phone line and I don't need one for it but the main phone is connected & it does need one to filter out the DSL noise.
1183943
You wont need one if you have a technician come out....otherwise....you only need one.
1867511
If you are buying only one switch, the hub is not needed. However, if you plan on having multiple smart devices, the hub keeps it all in one place. Otherwise, you'd have 5 apps running 5 devices rather than one app running all of your devices. Also, some devices, like my door knob do not have an associated app so you need the hub to operate it remotely.
1233026
I don't think it has anything to do with the number of phones. Phone(s) just have to have Bluetooth capability. You have to sync it to each Bluetooth phone once - then it is permanently set up. Works very well; just need to keep battery charged.
731448
We use ones that came with our phones. I think as long as you have USB plug on other end of phone connection you should be fine.
311278
I have a base and an extra handset and they both are exactly the same phone, so I would say you could just get the base set and be fine.
993816
You would need a blocker for each incoming phone line. The number of phones is irrelevant.
2162169
This is a splitter for a single telephone line where you can use two devices. If you connect two more splitters and connect them to the original splitter, you could then use four devices on one phone line.
447049
The piece in the photo is a handset in the home base. You only need one of these. The secondary handsets for other rooms are much smaller and are only chargers/holders for the handset. You only need one home base, it's the one that plugs into your phone service. The second, third...whatever do not plug into your house wiring, only to an electrical outlet for recharging. I hope that helped answer the question. The longer I have this phone the more I am liking it. I have the main home base unit, as shown in my living room and the other handsets with their chargers in bedrooms. On my nightstand I used double sided tape to mount the charger to keep it exactly where I place it. That worked perfectly. The piece in the photo is a handset in the home base. You only need one of these. The secondary handsets for other rooms are much smaller and are only chargers/holders for the handset. You only need one home base, it's the one that plugs into your phone service. The second, third...whatever do not plug into your house wiring, only to an electrical outlet for recharging. I hope that helped answer the question. The longer I have this phone the more I am liking it. I have the main home base unit, as shown in my living room and the other handsets with their chargers in bedrooms. On my... » Read More The piece in the photo is a handset in the home base. You only need one of these. The secondary handsets for other rooms are much smaller and are only chargers/holders for the handset. You only need one home base, it's the one that plugs into your phone service. The second, third...whatever do not plug into your house wiring, only to an electrical outlet for recharging. I hope that helped answer the question. The longer I have this phone the more I am liking it. I have the main home base unit, as shown in my living room and the other handsets with their chargers in bedrooms. On my nightstand I used double sided tape to mount the charger to keep it exactly where I place it. That worked perfectly. « Show Less
539053
I believe that you need to plug in one phone/answering machine and the rest can be cordless.
1313049
Why would you want to isolate a few appliances? Just protect the whole house and be done.
556869
You can use just one at a time. It comes with a little plug you use to plug the side you aren't using.
2174234
Bill, The answer is yes. Our set has only four phones, but I don't think that would matter. We have multiple people on the extensions frequently, and have never had a problem. Sound is clear and undisturbed by multiple use.
2211228
I only use one. That's my preference. Depends on what environment you plan to use it. I'd would purchase one. Determine if it meets your need thus, you may or may not want another.
1500799
Yes, You do. You only have to enter on one handset and it goes to all of them. My old one you had to enter to each set.
826905
No, each handset plugs into any outlet and only the base needs connected to a phone jack.
1705077
no, but you will be better off using just one. One connection fewer conflicts.