Shared and wholesale networks will be a hallmark of 4G business models, as seen in the US with Clearwire and LightSquared. Eventually, many countries will have only one or two networks serving multiple traditional and non-traditional wireless service providers. Russia has taken a big step in that direction with plans for 4G start-up operator Yota to support all four main cellcos with its LTE system. Yota ‘ the brand name for Scartel – started life as a flagship WiMAX carrier but last year started to add LTE to its mix. It has a complex set of spectrum holdings, with byzantine rules attached to them, but is likely to end up with a mixture of TDD and FDD networks, with a…