Altice are being very aggressive in the US mobile market.
Their new plan prices at $20/month for life unlimited everything (incl roaming and calls to 35 countries) for their existing cable customers and $30 month otherwise (for those near their 21-state footprint).
This is roughly half the cost of rivals.
You bring your own phone or buy one with 36 month zero financing.
US Mobile is very high margin for the incumbents AT&T and Verizon …