Message length problem

[mikevrind]

Hello,

I'm currently using this lib to connect to the Nexmo API. But I'm having some issues with the length of a text message.

I have a message that contains 160 chars, but still get split up into 3 separate SMS messages. According to the Nexmo website, 160 characters should fit into 1 message.
But why doesn't Nexmo send just 1 message?

[jbtibor]

An SMS can have 140 bytes (140 * 8 bits) not 160 characters. You can have 160 characters when using a 7 bit character set, however most if not all smartphones default to 16 bit unicode so the character limit will be 70 and 160 chars will be sent as 3 messages.
This isn't down to Nexmo, most if not all phones will split long messages into parts before sending.
https://en.wikipedia.org/wiki/Short_Message_Service#Message_size

You'll have to handle concat- flags sent by Nexmo, not exposed in NexmoMessage.
https://docs.nexmo.com/index.php/sms-api/handle-inbound-message