T-Mobile US and Sprint have received almost four times as many orders for Apple’s iPhone 7 than previous iPhone models, a sign the device may be well received and the carriers’ new unlimited data plans may be gaining popularity. T-Mobile’s Chief Executive Officer John Legere called the iPhone pre-order period the biggest in the company’s history. The company is also seeing subscribers switching from the three other major carriers -- Verizon Communications Inc., AT&T Inc. and Sprint, he said. T-Mobile reported orders over four days and Sprint over three days.

The iPhone accounts for about 64 percent of Apple’s total sales. The carrier’s reports are being watched closely because Apple has said it won’t disclose weekend sales number for the first time.

T-Mobile has unlimited data plans that start at $70 a month for one user and as low as $160 for a family of four during a promotional period. Sprint’s unlimited plan starts at $60 a month and also offers families of four a promotional price of $160 a month. Both plans were introduced earlier this month.