Question: In a Concatenated Short Message with a 16-bit reference number, what is the maximum length (in characters) of the short message within the TP-UD field for uncompressed GSM 7 bit default alphabet data?
Option 1: 133 characters
Option 2: 152 characters
Option 3: 160 characters
Option 4: 170 characters
Explanation: According to the specifications for Concatenated Short Messages with a 16-bit reference number, in the case of uncompressed GSM 7 bit default alphabet data, the maximum length of the short message within the TP-UD field is indeed 152 (derived from 160-8) characters. This ensures that there is sufficient space for the necessary headers while maximizing the payload capacity for this specific type of data encoding.