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T-Mobile CEO John Legere.

Verizon and T-Mobile are going at it again.

One day after Verizon announced its new unlimited data plans, T-Mobile added upgrades to its own unlimited product. Starting Friday, T-Mobile One — the Bellevue, Wash.-based carrier’s new single wireless plan — will include HD video and 10GB of high-speed mobile hotspot data.

Verizon’s new plan, which run at $80 per month, also includes 10GB of mobile hotspot data and HD video streaming.

T-Mobile CEO John Legere called his competitor’s new offering a “cave-in.”

“I don’t blame Verizon for caving,” he said in a statement. “They just lost their network advantage, and they know it … and more importantly, more and more customers know it. Their back’s against the wall.”

Legere, notorious for his use of social media, also took to Twitter on Monday to mock Verizon.

T-Mobile first announced plans to shift to a single wireless plan that offered unlimited data, called T-Mobile One, this past August.

This is just the latest round of punches in a heated battle between the two wireless services. T-Mobile ran a series of S&M-themed commercials starring comedian Kristen Schaal during the Super Bowl earlier this month mocking Verizon’s fees.

Verizon attempted to respond on Twitter, and things got weird.

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