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Shopping for a laptop as a Linux user:
Screenshot from the Simpsons where Otto is talking to Marge and Homer standing next to a window in their house with a caption "Oh wow, windows!... I don't think I can afford this place."
But AT&T does or at least did. You can/could put it in bridge mode though and use a secondary one. https://support.eero.com/hc/en-us/articles/207988076-Setting-up-eero-with-AT-T-U-verse https://forums.att.com/conversations/att-internet-equipment/can-i-use-a-different-modem-and-router-to-connect-with-uverse-internet/5df0012dbad5f2f6063a903b https://robotpoweredhome.com/att-modems/
For Comcast, I never said you can't just get unlimited. Just that it cost more than getting the modem with unlimited: https://www.xfinity.com/learn/internet-service/data $25/month for modem+unlimited while its $30/month for unlimited. Cheaper to take the modem even if you don't use it.