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I figured out how to do this a while back:
if you have an old, non-smartphone lying around (in a pinch, someone else's will do), then all you need to do is stick the sim card into that phone, get the unlimited dataplan for NON-smartphones (i think it's called something like medianet), then stick it back into your iphone. If you're on a family plan, you can reduce the price to $20, or potentially lower, for unlimited data. I managed to get a $10 unlimited data plan on my iphone 3g using this method.
 
2G Unlimited Data With New iPhone 4 - Question

I have read all the threads on obtaining 2g unlimited data plan and placing on new iPhone4. Question: What is the easiest way to do this, given the following without an existing account and buying a new iPhone 4 with a new account and number this week:

1. I have a 2g on its way.
2. I have a micro sim adapter on its way.
3. I have an extra new unactivated ATT micro sim on its way.
4. I will buy a new iPhone 4 this week and can buy at a ATT or Apple store, or from their online services. Which is preferred in your opinion?
5. ATT tells me that if I order online, the new iPhone 4 comes activated but is placed is suspension until you call them.

Thanks in advance -

Bond
 
I figured out how to do this a while back:
if you have an old, non-smartphone lying around (in a pinch, someone else's will do), then all you need to do is stick the sim card into that phone, get the unlimited dataplan for NON-smartphones (i think it's called something like medianet), then stick it back into your iphone. If you're on a family plan, you can reduce the price to $20, or potentially lower, for unlimited data. I managed to get a $10 unlimited data plan on my iphone 3g using this method.

some here have reported that this procedure isn't working any longer
 
It worked for me as of 12/1/10.

I am a brand new AT&T customer. I bought two new iPhones on 12/1/10 on a family plan.

I went home, read this thread, called a buddy with an old 2g laying around. I picked it up, went back to AT&T and spoke to the same guy I bought the i4's from and advised him I was going rock climbing in two weeks and dug up an old iPhone 2g that I will bring so I don't damage my new i4. He gave me the SIM at no charge (i brought the iPhone 2g with me to prove it). I told him I'd activate it home.

I got home, hooked it up to iTunes and selected the Unlimited package with 200 texts.

I got an email saying it was processing. I later got an email saying the process was canceled. I was unsure why, but I didn't give up.

I called AT&T on my land line and advised them of the situation and that I was going rock climbing. They asked for the IMEI number and the rep said they needed a supervisor's approval to add the unlimited, but that it is no problem. Within 5 minutes it was showing on my account.

I cut the SIM (google the tutorial) and stuck it in my i4. BINGO no issues.

I did this around 7:30pm and by 9am the next morning I received the text I had been waiting for. I checked my account and I was automatically moved to the $30 unlimited iPhone plan.

No problems
 
2G to 4G for unlimited data question

I would like to try buying a new iPhone4 this week and taking a 2g with sim adapter tray to activate and enable unlimited data on iPhone4 by switching sim from 2g to 4g as outlined in posts here.

Can I use the new sim from the new account iPhone 4 in the 2g (with sim adapter tray) to do this? Won't the newly activated iPhone 4 sim present a problem, or ?

Thanks in advance.

B
 
2g to 4g extended data

thanks, then use the new sim in the 2g and once activated through iTunes, transfter it to the 4g, right?

thanks again ...

B
 
Yep, exactly. I bought a SIM adapter on ebay, but I never used it. It came with a stencil for cutting the SIM into a micro sim though. I did this at 7pm and by 830 the next morning I got that much awaited text.
 
Is the $30 'true' unlimited plan eligible for corporate discounts?
Only to the extent that your FAN agreement provides for a data discount, not all FAN(s) have this data agreement with AT&T.

Also, the current $25 2GB iPhone data plan also qualifies for a discount on eligible FAN plans. The $15 200 MB iPhone data plan does not qualfy for a FAN discount.

Dave
 
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Is this trick still working? And do I have to have a 2g iPhone. Or can I use my old lg phone that doesn't require a data plan?
 
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8B117 Safari/6531.22.7)

Is this trick still working? And do I have to have a 2g iPhone. Or can I use my old lg phone that doesn't require a data plan?

I'm not sure if it still does, wouldn't hurt to try. I wouldn't see why It wouldn't work anymore.
 
I have a iphone 2G and iPhone 4 (Unlocked bought from UK). Both unlocked & JBroken.

Do they give Monthly / month to month unlimited plans? I need to use it for a week in Canada? Will that charge roaming?
 
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