Momentum for Google ’s gPhone is picking up speed.

Although it has been on their roadmap for quite sometime, the momentum is stronger than ever. A numbers of factors are pushing for it : Apple’s iPhone success has led the way, the mobile advertising market promises wonders ($14 billion by 2011 according to eMarketer) and Google could upload a great number of applications on their own phone. Googles needs to convince both the manufacturers and the operators. LG and Samsung have built prototypes; among carriers, T-Mobile USA and Verizon Wireless have ongoing discussions with Google.

Google considers offering a free subscription financed by advertising. According to Google Chief Executive Eric Schmidt « What’s interesting about the ads in the mobile phone is that they are twice as profitable or more than the nonmobile phone ads because they’re more personal. »

According to The Wall Street Journal, Google is investigating a great number of options and no doubt that these will be unveiled in the coming months.