To send SMS messages, you must first register:
Sender ID;
It is not possible to send SMS messages without a registered sender name — this is a requirement of telecommunications operators.
Limits for a single message:
If a message exceeds the specified limit, it is automatically split into several parts and charged as multiple SMS messages. When a message is split into parts, the limits change, as service data is sent along with the messages.
Limits when a message is split into several parts:
Please note that all characters, including spaces, are counted when calculating the character limit.
Most messengers support up to 4095–4096 characters in a single message.