# What is my friend trying to tell me?

My friend sent me the following short message:

D57919749C3641B796384D0795DDE33739ED3E03

How should I decode it?

Hint:

My friend's job is writing software for mobile phones.

Hint2:

The original message was 22 characters long.

Hint 3:

It is relevant that it was a Short Message that my friend sent me.

• Almost looks like a SHA1 hash.... – Tryth Jul 1 '15 at 11:45
• Clearly, this is simple hex and your friend is trying to tell you "Õytœ6A·–8M•Ýã79í>�" – Engineer Toast Jul 1 '15 at 11:57
• @Tryth, good thought but it's not a hash. – Vicky Jul 1 '15 at 12:04
• Something to do with mobile phone keypads? – Rand al'Thor Jul 1 '15 at 12:57
• Nope,. not to do with the keypad. – Vicky Jul 1 '15 at 13:06

Decoded it is - Use GSM 7-bit encoding