A lot of budget Android smartphones are appearing in 2011 – and we're not finished yet. Last week, we had the launch of the Orange San Francisco II and this week, we could have a UK launch of the T-Mobile Vivacity.T-Mobile itself has put images of the handset online, showing off the slim smartphone on a 'coming soon' page. But that's all the official detail available, with the company failing to list the specification of the handset, which isn't ideal when it is keen for you to 'register your interest'. Luckily, others have details of the Vivacity to hand.One of those is Unwired View. That site claims the Vivacity is made by ZTE, but branded T-Mobile instead, packing a 3.5-inch display (either HVGA or WVGA), along with a five-megapixel camera on the back, a front-facing camera for video calling, Android 2.3 Gingerbread for the operating system and the likes of 3G, Wi-Fi and GPS finishing things off. In other words, all the basics covered.Pricing hasn't been disclosed anywhere, but our assumption of this being a budget handset is likely to be a safe one. Expect it on pay-as-you-go for around £100 or for 'free' on a modest monthly contract.