A:Answer Thank you for your question. The KX-TGD564 was released in 2017, it has Link2Cell, you can check this link for further details: http://help.panasonic.ca/viewing/ALL/KX-TGD562/OI/TGD562_PNQX8351ZA/TGD562_PNQX8351ZA.pdf#page=17 , this Phone System also comes with 4 cordless handsets. The KX-TGD564 has Call Block, Caller ID and Talking Caller ID, Phonebook entries up to 3000, Voice Assistant( You can use the handset to operate the voice recognition feature of a paired cellular phone (Siri®, Google Now™, or S Voice). For example, you can speak into the handset and command your cellular phone to make a call). The KX-TGE633 comes with 3 cordless handsets, has Call Block and Automated Call Block, Caller ID and Talking Caller ID, doesn't have Link2Cell and Voice Assistant, Phonebook entries up to 100, both of them have Answering Machine.