In the context of SMSPassword a SMS Password is a one-time password password send by means of SMS. Or Short Messaging Service. Using the GSM network to a mobile device to esteblish two-factor athentication.
From Wikipedia:
Short Message Service (SMS) is a text messaging service component of phone, Web, or mobile communication systems. It uses standardized communications protocols to allow fixed line or mobile phonedevices to exchange short text messages.
SMS was the most widely used data application,with an estimated 3.5 billion active users, or about 80% of all mobile phone subscribers at the end of 2010. The term “SMS” is used for both the user activity and all types of short text messaging in many parts of the world. SMS is also employed in direct marketing, known as SMS marketing.
SMS as used on modern handsets originated from radio telegraphy in radio memo pagers using standardized phone protocols. These were defined in 1985 as part of the Global System for Mobile Communications (GSM) series of standards as a means of sending messages of up to 160 characters to and from GSM mobile handsets. Though most SMS messages are mobile-to-mobile text messages, support for the service has expanded to include other mobile technologies, such as ANSI CDMA networks and Digital AMPS, as well as satellite and landline networks
SMS today
In 2010, 6.1 trillion (6.1 × 1012) SMS text messages were sent. This translates into an average of 193,000 SMS per second.SMS has become a huge commercial industry, earning $114.6 billion globally in 2010.The global average price for an SMS message is US$0.11, while mobile networks charge each other interconnect fees of at least US$0.04 when connecting between different phone networks.