"home zone" functionality

Tilman Baumann tilman at baumann.name
Thu Apr 17 11:59:31 CEST 2008

Alexey Feldgendler wrote:
> On Thu, 17 Apr 2008 10:34:20 +0200, Tilman Baumann <tilman at baumann.name> 
> wrote:
>> The home zone icon uses a rather strange SMS feature.
>> I don't know details. But there are several message types.
>> Like messages which pop up without asking the user to open it.
>> Or like the O2 logo. Which is a SMS with (smehow) a emebedded 
>> pictogram ebedded. Which your phone shows in some status bar or the 
>> background.
>> This icon can only be re-set if you get a special delete SMS.
> AFAIK there are no such things as executable code in SMS. 
Sure not, never said that.
> There are 
> specially formatted SMS that set or recent certain flags. For example, 
> there are standardized flags (and ways to set and reset them) for 
> voicemail and fax icons. O2 is probably using an undocumented (reserved) 
> flag bit for their home icon.

AFAIK it's really a picture.


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