Sprint this week moved to entice U.S. mobile users away from its main rivals by offering them savings of 50% on their existing tariff.

The offer applies to AT&T, Verizon and T-Mobile US customers. It applies to most tariff plans, but excludes unlimited music and video streaming, data carryover and cloud options that other carrier plans may offer, Sprint said.

The telco is so keen to poach its rivals’ customers that it is also offering to pay up to $650 worth of switching fees.

"We are so confident that customers will have an amazing experience that we are encouraging them to give us a try with the biggest wireless offer in the history of our industry," said Sprint CEO Marcelo Claure, in a statement.

"Customers switching to Sprint will never need to look elsewhere. They will learn what our 58 million customers already know – Sprint offers the best value and an award-winning network," he said.

Naturally, the announcement triggered a reaction from T-Mobile US CEO John Legere who, as usual, took to Twitter to voice his opinions. Thus ensued bickering between the pair, which is probably not worth repeating.

T-M obile US overtook Sprint as the third largest mobile operator in the U.S. earlier this year, but the pair remain relatively close in terms of customer numbers.

T-Mobile had 61.2 million customers at the end of the third quarter, compared with Sprint’s 57.9 million.

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