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This messages are so-called

This messages are so-called USSD messages your mobile device (cell phone in this case) receives in USSD push mode. This messages are being send from the russian end-user mobile number (+7 is a russian international phone code) and it's hard to tell either why does this russian mobile operator (local code 919 is operated by regional subsection of MTS mobile phone operator - one of the biggest mobile operators in Russia) allows to send USSD messages from the customers cell phones. As far as I know USSD outgoing text messaging should be blocked by default as it allow to send direct-to-phone-display spam and may allow forgeries by third parties. It is also strange that your phone was selected as one of the targets - I can hardly see any ways they may use to fool you and make any profit by sending messages like you had published.

Most probably this messages are the products of the unqualified persons trying to develop (or to correctly configure) SMS spam sending software - this kind of illegitimate advertisments was gaining an increased popularity last years. I live in Moscow and it is typical nowadays to receive about 20 spam SMS messages per week and I can hardly see any signs that the situation would become any better soon.

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