What features did ATT Lock on 1020?

[AR2186]

I am using it in Singapore with the carrier Singtel.
Not too sure on that, it says to contact ATT whenever I access tethering. Maybe changing my country to something that's not US might fix it.

I have not tried that so far.

Use Access Point to make sure your APN's are correct. When I put a T Mobile or AT&T SIM card in my Verizon Lumia 928 I get the same pop up, but Access Point configures it properly

 

[whatup12]

After reading all of this things about the tethering, i'm still confused. It seems to me that AT&T branded L1020 has purposely messed up tethering by AT&T. I have Nexus 4 too with the same APN as my Lumia 1020 and the tethering on my Nexus 4 works without any problem (the Nexus 4 is bone stock, nothing modded) on any supported network. I'm not sure how ATT knows that tethering is being turned ON if it is not a function of the software/firmware that pops that error message (on Android there is a small daemon that runs in background and first thing people remove after they root)? The towers can't tell the phone "Oh, you have not payed for tethering plan, so next time better luck buddy" (or at least not yet). It has to be the firmware that is blocking the tethering, so if this is true it could explain why we are seeing this erratic behavior of the ATT L1020 tethering when different sim card is used (assuming sim unlocked). It seems to that AT&T is to blame for messing up (blocking) the tethering, since tethering should work with a different sim card. But it could be a bug on Nokia/Microsoft side.

So you are saying that with a stock Nexus 4 from ATT that is sim unlocked--you can internet tether?

And amazingly, I just tried to order the 1020 from MSFT store and was shot down since i tried to ship it to my work address and bill to my home address. Both in the same city. they even took my whole SSN and birthdate, confirmed my identity and then told me no shipping to different address. I am no fan of AAPL, but I am sure it must be easier to buy a product from them...and that pains me to even type.