Starting tomorrow until May 28, T-Mobile will be holding a buy-one-get-one free sale on a handful of 4G smartphones.

T-Mobile customers who purchase a 4G smartphone will be able to receive a second 4G handset of equal or lesser value for free. Customers will be able to choose from the following devices in the promotion: HTC One S, Samsung Galaxy S II, HTC Radar 4G, Samsung Galaxy Blaze 4G, HTC Amaze 4G, and Nokia Lumia 710.

Those who purchase any of the 4G-enabled devices listed above will receive a second unit of their choice for free after a mail-in rebate. Customers must purchase the devices under the T-Mobile Classic Plan or the T-Mobile Ultimate Value Plan in order to receive the sale.

New customers and those eligible for an upgrade who sign up for a new two-year contract will be able to take advantage of this end of the month sale.

The BOGO promotion will be available at participating T-Mobile stores nationwide.