Why use mobile phones? It's a way to help us verify that an account is being created by a real person, and that one person isn't creating thousands of accounts. We want to keep our system as spam-free as possible, and making sure accounts are used by real people is one way to do that.
We're also working on some new mobile features that will make your Google account more useful and secure, such as SMS alerts and password recovery. When you sign up using your mobile phone, you can choose to save your number with your account so you can use these features as soon as they become available.
Right now, sign-ups only work with U.S. mobile phone numbers, but we're eager to support others. With Gmail now available in 29 languages (and counting), we're already working hard to bring you "注册 Gmail 邮箱," "Zaregistrirovatьsя v sisteme Gmail," "Abra sua conta no Gmail" and many more.
tako da su pozivnice i dalje neophodne.