Google requires use of short code 46245 (GMAIL)

Google has included SMS in the creation of a Gmail account. Check out https://www.google.com/accounts/SmsMailSignup1. According to Google, "You need to receive and enter a special invitation code in order to create an account. Currently, we are only sending these codes as text messages to mobile phones." They say this cuts down on email spam. They also say that "if you choose to, we can save your mobile phone number in your Google account, so that you will be able to use it for upcoming Google mobile services like secure password recovery and SMS alerts. In accordance with the Gmail Privacy Policy, your number will never be sold or shared for marketing purposes without your permission, nor will we contact you using this number without your express permission."