SMS from the site operator: so similar and so different services

SMS from the site operator: so similar and so different services Web page mobile operators have traditionally been almost the most visited resources on the network. All thoughtfully examine tariff plans and read the news? Of course not, the reason for the extraordinary popularity - an opportunity to send free SMS-message. It turns out that this seemingly simple service is implemented by different operators in different ways, and in some cases we are faced with surprises.