phone number sent from headers

i have a wireless site that is aimed at vision users only. when i first got vision, sprint was the only major carrier that had any kind of good internet access plan for the average person. if this is not the case, please correct me, because i would love to have my site be more universal.

anyway, trying to detect a mobile browser has been hell. i relied on seeing if 'mozilla' was in the browser agent but the sanyo 8100 ( i believe ) sports that so i quit using that.

for a long time i've had no kind of detection at all, so you can access the site via pc, but i don't want that to happen.

i'm now seeing if there is a "@sprintpcs.com" in the "ClientID" header. i have a couple of questions about this, though.

is the stuff before the @ our phone number encrypted?

if it is, is there anyway to decode this information? (i would assume the answer is no)

again, if it is, is this a one way hash? or can it be decoded? (i would assume it would have to be decoded.. doesn't really make sense to have it be a one way hash)

does this value ever change? i would LOVE to know the phone number for verification. but if i don't know the phone number, can i rest assured that this clientid does not change? can i use this is a surefire verification check? does this id get reset after browser reset? vision reset? phone turned off/on? anything?

if anyone knows these answers, i would greatly appreciate your sharing them with me :D

By wfrantz at 30 Jan 2004 - 16:22
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By mkaymer at 20 Aug 2010 - 07:16
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phone number sent from headers

Alas, you can't do what you want. I should add this to the "How do I...?" forum.

There is no way to uniquely identify a SprintPCS handset using HTTP headers. The ClientID is an encrypted session ID that changes randomly and only Sprint knows how to match up a ClientID with a phone number. The only thing you can do is use cookies to detect return visitors.

If you just want to detect WML browsers, I have a PHP script for that. Read this:
[url]http://www.sprintdevelopers.com/postt24.html[/url]

I should probably update that script. You suggest looking for CLIENTID and assuming the user would want WML pages. I think that's a great idea.

By wfrantz at 3 Feb 2004 - 14:43
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phone number sent from headers

i think checking the clientid would and assuming that wml works is alright, but not necessarily that the user wants wml. my site is almost purely xHTML which 3gvision supports but 2g pcs wireless web does not. i imagine though that checking other sections of the header would be sufficient to decide whether or not the user can accept xhtml or wml.

i haven't actually looked at it (and can't really test because i don't know anyone with a 2g phone + wireless web), but i imagine the http-accept (or something like that) headers are much shorter and do not contain html extensions for 2g phones.

By wfrantz at 3 Feb 2004 - 22:01
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