The HTC TUBE concept phone pictured here actually seems like an advanced version of a modular phone, similar to what Modu offers, though sadly that didn’t work out too well. The phone is divided into two main components, the outer shell and the inner “cartridge”. While the external features and design of the phone remain constant, the phone will be radically changed, depending on the cartridge that you insert. Cartridge capacities range from 8GB to 64GB and offer various operating systems including Android 2.2 Froyo, Windows Phone 7 and also the option for dual-booting. Camera quality also changes from 3.2- to 5.0- and finally 12.0-megapixels. Seems like a really cool design and if they managed to get past the hurdles that Modu faced, then perhaps it can be a successful product.