Android back on top of US smartphone share in January

Android reportedly took back the lead at 49.4 percent of American sales between November and January, improving its overall position versus the same month last year. Not that everyone else was necessarily hurting -- iOS still had a 45.9 percent slice of the pie, and the continued Window phone 8 rollout took Microsoft up to 3.2 percent

This post is exactly what I was looking for it is a great help!!!

Thanks,
DG

It is the cycle buddy.
Android captures the market when new iPhone is about to release and once Apple launches new product they captures the major share.