Why is every part of concatenated message shorter than 160 characters?

Concatenated messages require a header to identify which message comes before the other, time of sending, id, etc. This extra information takes up the space for 9 characters. Therefore a 2-part concatenated message could only contain 151 x 2 characters as opposed to 160 x 2.

The maximum number of concatenated messages you can send using email to sms is 5.

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