July 7, 2009 at Added sms verification of Google account during registration
Around the beginning of July, some users who want to register a new account on Google Gmail began to ask for confirmation of registration from a mobile phone! Prufpik: 
It is worth noting that not all require such confirmation, apparently it depends on the region. Google itself explains this as measures to combat spam and spam.
After entering your number on your mobile phone, an SMS with an authorization code arrives, which must be entered on the site. What’s most interesting, Google stores phone numbers in its database for "limiting the number of accounts per mobile number." The size of this restriction is not specified. Actually, here you can read the comments of Google itself.
Personally, this “security supplement” seems superfluous to me, it removes any anonymity of the user, and for many it is fundamentally important.
Recently, Google has been actively adding various SMS services, the last one was the ability to send a forgotten password via SMS, but all of them were voluntary and did not require a mandatory phone number. One way or another, while all this is valid only in the USA and apparently in test mode.
It is worth noting that not all require such confirmation, apparently it depends on the region. Google itself explains this as measures to combat spam and spam.
After entering your number on your mobile phone, an SMS with an authorization code arrives, which must be entered on the site. What’s most interesting, Google stores phone numbers in its database for "limiting the number of accounts per mobile number." The size of this restriction is not specified. Actually, here you can read the comments of Google itself.
Personally, this “security supplement” seems superfluous to me, it removes any anonymity of the user, and for many it is fundamentally important.
Recently, Google has been actively adding various SMS services, the last one was the ability to send a forgotten password via SMS, but all of them were voluntary and did not require a mandatory phone number. One way or another, while all this is valid only in the USA and apparently in test mode.