Guarantees: Charter said it will begin guaranteeing $1,000 of savings per year for customers who take internet and two mobile lines. If Charter cannot meet that savings compared with “the big three telco carriers,” it will credit the difference on the bill during the first year.New “Invincible Wi-Fi” product: Charter plans to launch Invincible Wi-Fi in February, describing it as a “market-first” bundle combining Wi-Fi 7, battery backup, and backup 5G service that seamlessly switches on the same SSID during ...