The merger of America’s third and fourth largest mobile carriers is designed to create a more competitive firm with about 130 million customers.

However, the deal is expected to attract regulatory scrutiny over its potential impact on customer prices.

T-Mobile boss John Legere said the new firm would spend $40bn on building a 5G mobile network in the next three years.

“Together, we will build the highest-capacity mobile network in US history!! I’m talking 30X more capacity than T-Mobile today!!” he said in one of a series of Tweets.

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