Some ten or twelve years ago, the tariffs of Russian mobile operators were so expensive that the usual short message - "SMS" - was an unaffordable luxury for many. Nowadays, short messages have long ceased to be something special, and sending them in the presence of the Internet is as easy as shelling pears.
It is necessary
availability of Internet access, recipients' mobile phone numbers, ability to use search engines
To send a short message to a subscriber's number, you need to find out his telecom operator - without this, the message may not be sent. If there are several subscribers, it would be better to group them according to their belonging to a particular network.
The vast majority of mobile operators, including international ones, have a special form on their official websites for sending short messages. The terms of service for different operators may differ, but on the official sites it is free. For example, only subscribers of this operator can use the form for sending messages from the MTS website when their mobile is turned on. Pages of the largest operators: MTS: https://www.mts.ru/messaging1/sendsms/Beeline: https://www.beeline.ru / sms / index.wbp Megafon: https://sendsms.megafon.ru/U-tel: https://www.u-tel.ru/facilities/smsTele2: https://www.ru.tele2.ru /send_sms.html
If necessary, you can use the services of a significant number of service sites, such as smste.ru, sms3.ru or smsas.ru. The number of mobile operators here is quite large and captures companies from other countries, but there is no guarantee of message delivery to the addressee, especially when the site server is loaded.