1. Standard GSM 03.38 Character Set

Single text messages are limited to 160 characters, including spaces. The maximum length of two-part or three-part multipart text messages is 306 (2 x 153) and 459 (3 x 153) characters, respectively. You could send up to 1000 characters as multipart message which will be split into 7 messages internally. This refers only to messages that contain the standard GSM 03.38 character set.Each multipart text message is limited to 153 characters rather than 160 due to the need for user-data headers (UDHs) information. Mobile phones use UDH information to enable them to link long messages together so that they appear as single SMS messages in recipient’s phone inbox.

2 Unicode Characters

Using Unicode, for languages such as Hindi, restricts your message to a maximum of 70 characters per SMS. You can, however, send longer text messages, with our system splitting them into two or at the three separate text messages. The maximum lengths of two-part and three-part multipart Unicode text messages are 134 (2 x 67) and 201 (3 x 67) characters, respectively. You could send up to 500 characters as multipart message which will be split into 8 messages internally.