Are they going to an undesirable website on your cell phone?
If on Apple devices signed into iCloud on the same account and history is not cleared, it would pop up on your device saying history was there.
Same thing with google chrome and Microsoft Edge.
I am not a Comcast Employee. I am a Customer Expert volunteering my time to help other customers here in the Forums. We ask that you post publicly so people with similar questions may benefit from the conversation. Was your question answered? Mark the post as Best Answer!