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Originally Posted by
Rapplestillskin 
it is showing I have full reception with 3G and they then try to go online but couldn't! Then tgey turn on wifi and can go online.
Ah, not just Siri, but the entirety of Internet stuff. Okay, so that's either a problem with the network or the cellular telephony chip in the phone itself.
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But I said why can't on 3G full bars showing on the phone w/ wifi off get me online?
I don't have a perfect answer, but the problem has one of the above two causes.
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They said it a network thing! How can it be a network thing if it has reception & 3G ?
That does sound contradictory, doesn't it? There's a simple explanation, however. Oh! I've thought of a third option. It's quite implausible, but it could be the case: your account had a hiccup and didn't register properly.
I personally have a first-gen iPhone. I don't have any sort of plan with it whatsoever, so I can't make calls or use cellular data. I just use Wi-Fi. Wherever I go, I receive signal on my phone. It shows up with both bars for calling and an "E" for EDGE service. But I cannot access things that could use either of those features because I don't have a plan with my phone.
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I can call , text but not get online!
And this makes the above sound less plausible, but not entirely impossible.
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They took out my sim and put back in and fix for long enough till I leave and then same problem.
Ah, this is interesting. It could also be a problem, then, with your SIM card; either the way it was seated in the phone or the connector pins in the phone itself.
You did do the right thing in swapping your device out. However, I personally would have swapped for a new 4S. Siri is not to blame here, nor is the concept behind the 4S inherently to blame. You have a working phone now, yes, but you waited for the express purpose of getting a 4S. The speed (both of the network and the device itself) and new features will serve you much further into the future than the iPhone 4 will be able to.
I am of the belief that you should be able to still go back to the Apple Store, tell the manager (you might very well need the manager's approval at this point) your story and that you'd like to swap back to a 4S, and then try another 4S.
Of the what was it, five possible problems this could have been, three of them sound like iPhone hardware issues rather than AT&T hardware issues.
I think you should give it another go, but that's me. Thank you for continuing to give us information about your situation; I apologize for any harsh words earlier, but you had left out so much that your story seemed shaky. Having all this extra information allowed me to pare down the possible causes of the problem, and it does sound like, more than the network, you may have had problems with that specific device.