New device using my wifi

Hello @mcarol73, Thanks so much for taking a moment out of your day to leave a post on our community forum and we would be happy to help. To remove any device from the Devices Not Connected list:

1. Tapping on the device.
2. Tap Device Details.
3. Select Forget Device.

This will remove the device from your devices list and unassign it from the person it was associated with, if applicable. It'll also permanently delete all historical network activity of this device. If the device reconnects to your home network, it will appear as a new device.

Pause and unpause devices

Pausing a device blocks it from accessing the internet when connected to your home network. In-progress activity might not stop immediately. Access to local network devices (like printers) and connections that use cellular data or other WiFi networks won't be paused.

To pause a device:

1. Select the device from WiFi.
2. Select Pause Device.
   • You can pause the device(s) for a specific amount of time (for example, 30 minutes, one hour or two hours) or indefinitely until you choose to unpause.

Notes:

• The pause function only pauses WiFi access on your home network and doesn't impact access to cellular data, a public Xfinity WiFi hotspot or other available WiFi networks.
• When attempting to access the internet on a paused device, you'll see the device's default message that the site cannot be reached or that it isn't connected to the internet.

@mcarol73 

And don't forget to change your WiFi password to a strong one !