The main problem with SMSC is the abundance of features, which leads to a complicated interface. It would be better if everything were organized more logically, but if you take the time to get used to it, it becomes less noticeable. However, the functionality is impressive. In addition to SMS, there are voice broadcasts and email options available. There is also a real-time preview feature. To test the service, you can fill out a small form and receive 15 rubles for testing. When I checked SMSC, the message arrived within 1.5 minutes after sending. The sending time when working with payment is the same. The rates are transparent. Although the interface looks confusing, all payment conditions are clearly stated: country of origin, operator, message type, and volume.
