I can only say what AVM has told me. Callmonitor is removed from the 6490 with the OS 7.0 and they also told me that they will remove it from all other boxes as well. They did not tell me in which version on which box. Hete are some emals:

"Sie schildern, dass Sie den Callmonitor nicht mehr aktivieren können und möchten wissen, wieso dies der Fall ist. Ich bedauere diesen Umstand und nehme mich gerne der Sache an.

Der Callmonitor wird mittlerweile nicht mehr von den FRITZ!Boxen unterstützt. Wenn Sie mit mitteilen, was genau Sie vorhaben, kann ich Ihnen ggf. Alternativen aufzeigen. "

"Sie möchten wissen, bei welchen FRITZ!OS der Callmonitor noch unterstützt wird und wie Sie Ihre FRITZ!Box 6490 entsprechend downgraden können. Gerne beantworte ich Ihnen Ihre Frage.

Ab welchen FRITZ!OS der Collmonitor nicht mehr unterstützt wurde, kann ich Ihnen nicht sagen, da dieser aufgrund der unterschiedlichen FRITZ!OS der verschiedenen FRITZ!Box-Modellen sukzessiv geschehen ist.

Ein Downgrade von dem FRITZ!OS bei FRITZ!Box Cable ist leider nicht möglich."

Just be carefull and better ask befor you make an other update if you want to keep on using the callmonitor! It does not work here anymore and no way back. :(

Please read this befor you update your Fritzbox with a new FritzOS!

I upgraded my Fritzbox 6490 to the new FritzOS 7 and the callmonitor stoped working. I tried to but I could not reactivate the callmonitor. Nothing seemed to work and I thought I did something wrong. I contacted AVM to help and got a realy bad answer: They told me that AVM has removed the callmonitor functionality. I asked them how I could downgrade the OS to get the functionality back but they told me that there is no downgrade option. They also told me that they are going to remove the callmonitor functionality from all of their routers OSs.
Warning to everyone: If you want to keep on using the callmonitor do not install FritzOS updates without checking if the new OS still supports the callmonitor. I would aks AVM befor updating.

I am not sure if it helps but maybe everyone should write them an email and ask to keep or bring back this feature?!

With this plugin I now can only see incomming calls (only the number) but no list with history of calls anymore. :o(

Is it possible to include a BT detection to switch profiles? RPi3 has a build BT which is not used (at least in my configuration) by the MagicMirror. It would be great if personal stuff like the calender could be switched depending on the BT device (Smartphone, Smartwatch, Fitnesstracker, …) which is near by.

I was searching for identification via BT on the RPi and this is what I have found so far:

“…present/absent can be done with very little power consumption on rPi and iPhone. Install bluetooth dongle on rPi as: (sudo aptitude install bluetooth bluez-utils bluez-compat). Figure out mac of your phone device by making it searchable and then do (hcitool scan) on rPi. Then connect to your device (make sure its searchable) as: sudo bluez-simple-agent hci0 mac_of_your_device and say yes on both sides. Then sudo bluez-test-device trusted mac_of_your_device. Now they both “know” each other. Then do sudo hcitool name mac_of_your_device in your favourite script to figure out if the iphone is nearby. This will not create a connection - but just say hi to it. If it returns a name, phone is nearby. If it returns nothing - phone is not nearby or bluetooth is switched off. Compared to creating connections or other distance computation methods out there - this method conserves battery on both sides and keeps airwave pollution to a minimum.” (found here)

and this would be even better with distance sensing:
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=47466