No, there isn't a texting character limit.
However, longer messages will require more Texts or Credits to send out to your recipient.
For text-only messages
Our text messages follow SMS conventions and take 160 characters per message.
If your message exceeds 160 alphanumeric characters, the message will be broken up into multiple segments, and therefore take multiple Credits or Texts.
For messages with emojis
Non-alphanumeric characters like emojis can cause the message to be segmented, resulting in more Texts or Credits per message to send.
These texting conventions applies to incoming text messages. If a recipient sends you a long text message, then more Texts or Credits will be deducted as well.