T-Mobile has revised its promotional device policy, now permitting customers to acquire up to four discounted smartphones on a single account, a significant increase from the previous limit of two. This change addresses complaints from sales representatives and aims to attract families looking to switch carriers, as many families have more than two members. The new policy also extends to long-time customers who previously received free lines through the 'Line On Us' promotion, allowing them to obtain promotional devices on those lines. However, customers who received free lines via Buy One Get One (BOGO) offers are excluded from this promotion. This adjustment by T-Mobile is a strategic move to enhance customer satisfaction and potentially boost new subscriptions.