Sony has revised its financial forecast for this fiscal year down $1.7 billion thanks to poor smartphone performance, and now expects to make a pre-tax loss of $466 million rather than a profit of $1.2 billion. A note to investors (via Games Industry) explains that the company plans to change its mobile strategy in certain regions, with Reuters suggesting the fact that Xperia phones can only be bought on T-Mobile in the US is having a negative effect as it's the fourth largest carrier there.