hacking a mobile's SMS files?

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From	Unknown <dog@gmail.com>
Newsgroups	comp.os.linux.hardware
Subject	hacking a mobile's SMS files?
Date	Thu, 21 Jan 2016 17:47:55 -0000 (UTC)
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Here in S.Africa [3rd world going 4th] I bought a cheap ZTE mobile,
hoping to be able to transfer text between my computer to someone who
has only got a mobile.

It was a complete failure, but works nicely for audio: playing 
TextToSpeech and a radio.

Now I've become curious again to see how I could eg. read/write
the SMSs directly from the computer.

The non-SD-card memory where the SMS's are stored, is only 
770 block [35KB].

So I saved this mem to file:A, 
 added "abc" to the tail of an existing stored/readable SMS
 and saved that as file:B

 cmp -l A B <-- shows 12 bytes difference between files A & B
 1103 307  43
 1104 206 221
 1111 307  43
 1112 206 221
 5647 307  43
 5648 206 221
 5655 307  43
 5656 206 221
 5679 307  43
 5680 206 221
 5687 307  43
 5688 206 221

What going on here?
OK, it's 6 double-bytes.
Perhaps if I'd added 5 chars instead of 3, I'd have gotten
10 double-bytes different.

No!! The 6 double-bytes are identical.
Redundant, repetition.
It seems that the 3 new chars are in 1 double-byte, which
is possible. 

fdisk identifies the file system as QNX.
And  wasn't able to mount it.
And used `dd` to read the contents.

Let's look at the Hex:
A=
00000450 35 48 00 00 | 00 00 C7 86 | 35 48 03 00 | 00 00 00 00  
5H......5H......
00000450 35 48 00 00 | 00 00 23 91 | 35 48 03 00 | 00 00 00 00  
5H....#.5H......
=B

BTW. the file names are written in plain ASCII. eg:
.... 20 20 20 10 | 00 00 99 A0  PHOTOS 

Does someone here know the SMS protocol ?

== TIA.

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hacking a mobile's SMS files? Unknown <dog@gmail.com> - 2016-01-21 17:47 +0000
  Re: hacking a mobile's SMS files? "Carlos E. R." <robin_listas@invalid.es> - 2016-01-23 03:17 +0100

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