T-Mobile’s new summer smartphone promotion is a scorcher: The carrier has eliminated down payments entirely and dropped the price of all devices to $0. Even the latest handsets like the iPhone 5, the Samsung Galaxy S4 and the Sony Xperia Z are included in the hot new deal, which the company announced today.

But there is a catch.

Earlier today, we told you about MoDaCo.SWITCH, a terrific new tool for the HTC One that allows you to install both Sense and stock Android and switch between then at the touch of a button. At the moment, it’s only available on one device, but MoDaCo has plans to bring it to the Galaxy S4 (i9505) in the near future.

If you’d like to see that happen, here’s how you can make a pledge to support its development.

British retailer Phones 4U has today launched a new Arctic Blue variant of the Samsung Galaxy S4. It’s available on contract only, with prices starting at £37 ($57) per month if you want to pay nothing upfront for the handset itself. The handset also comes with a free Samsung S-View case.

The Sony Honami, the Japanese company’s next flagship smartphone, has been pictured again ahead of its official unveiling. Many expect this device to be a much-improved Xperia Z, and when you take a look at the shots, it’s easy to see why — it looks almost identical.

One carrier recently announced that Samsung was planning to skip the Android 4.2.2 update for the Galaxy Note II and update it to the upcoming Android 4.3 release instead. And it appears the Korean company may have similar plans for the Galaxy S III, which has already been spotted with Android 4.3 onboard.