A Comscore study on the state of the US mobile market was just released and shows that the iPhone’s popularity still continues to grow. The iPhone has increased its market share from 24.1% in September 2009 to 25.3% in December 2009. The Blackberry which has always held a dominant position has declined from 42.6% to 41.6% of the market between September and December. The fact that both Apple and Android were able to increase their share of the market while all other smart phones decreased gives us good reason to believe that in the next few years these platforms will be the two dominant players. Mix the high market share numbers of Apple with their strong click through rates for advertising and you have a very attractive medium to engage consumers on. These are all signs that having a mobile strategy whether you are a publisher or an advertisers is a must in 2009, even if it is just part of your trial budget.