I used the SMS center's services for several months before deciding to switch to a more customer-friendly company. The main issue was strict moderation. Firstly, there is a complete lack of privacy. Although the service is not intended for personal correspondence and is mainly for sending promotional messages to clients, there were times when I had to share confidential information like passwords. All messages are seen by moderators, which means the information goes through third parties. Secondly, some messages get blocked due to suspicious words. I couldn't find a list of prohibited words, so every time it was a gamble whether the message would pass moderation. Fortunately, only the first message in a mailing list is subject to review; the rest are sent instantly. On the positive side, I can mention the reasonable prices. When I used the services, the cost was average. Any potential increases depend on the operators' tariff hikes, so the service isn't to blame in that regard.
