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Long English SMS or Multipart SMS in GSM-7
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May 16, 2025
10:11 am
Henk Helmantel
Admin
Forum Posts: 1550
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May 28, 2013
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Hello Amal,

The message encoding of SMS messages is quite complicated, you can find the full overview in ETSI specification 3GPP TS 23.038.

The specification has a good overview of all the character set options and the 7-bit packing of the SMS messages but it can be a bit overwhelming.

Regards, Henk

May 15, 2025
12:06 pm
Amal
Guest
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Hi Henk Helmantel,

41010C9119086526290200000C050003010201AEE8B2BC0C0A is exactly decoded as 'Where" in Diafaan website without any garbage in Multipart Englsih SMS

AEE8B2BC0C0A -> Where

can you share me the logic for this?

I have tried manually with 7 bit packed to 8 bit to create 1 byte.

For the first character i.e.,
'W' -> 87 (ASCII VALUE) -> 0x57 (Hex value) -> 1010111 (binary - 7 bit) -> 1010 1110 (Binary 8 bit , 0 added right side , left shift) ->
AE

h -> ?

e -> ?

r -> ?

e -> ?

Please help me to understand the logic behind for Multipart English SMS.

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