The Samsung Galaxy Ace, otherwise known as the S5830, is available from Carphone Warehouse for as little as £120 on PAYG, including £10 top-up and free delivery. It is also highly likely that the phone is unbranded and unlocked.
The handset is actually very similar to the Apple iPhone 3GS. Like the 3GS, it has a 3.5in 480 x 320 resolution display (with a Corning Gorilla Glass overlay) and a Qualcomm MSM7227 chipset clocked at 800MHz.
Other features include 278MB of RAM, 158MB of storage (with a microSD card slot), TouchWiz 3.0, Wi-Fi, Bluetooth, a microUSB port, a 5-megapixel camera, Android 2.3 Gingerbread (with Touchwiz 3.0) and a 1350mAh battery. It also weighs in at only 113g.
Other rivals within the same price range include the Sony Xperia U, available for around £20 more, the Huawei Ascend G300 and the new Acer Liquid Duo or Gallant.
Source: Carphone Warehouse