I can confirm that the unlocked/ unbranded 1020 at the Microsoft Store does tether successfully on T-Mobile with cyan.
Just picked up unlocked/unbranded 1020 from Microsoft Store physical location and came with cyan out of the box. Also just signed up for T-Mobile promo family plan unlimited data + 5 gb hotspot. When I toggle on internet sharing on the 1020 it toggles off and tells me I need to upgrade my plan. The other phone on the plan is an android and the hotspot works fine, I would try switching sim cards but the phones use different sizes, but I really don't think that's it cause when I logon to the T-Mobile account it shows both lines as having unlimited data + 5 gb hotspot.
So I've been reading these threads for a few days and have seen the other threads re access point and international sim cards. I don't know if this is weird or not but when using the store on the phone I remember searching for access point and finding it. Now when I search access point no longer shows up. Then when I did an ie search and click on it it brings me to the app in the store where it says I already have it on my phone. Who knows I could have downloaded it but don't remember doing so.
One reason I got lost was when I looked for access point in the list of apps it's not there, but instead under settings. Is that where it should be and if so are you able to delete it from there (like done in the intl sim procedure) because I don't see any way.
I'm new to windows phone and the phone is for my wife she's all about the camera, this fit the bill and the price was a pleasant surprise. She loves the home screen with the transparent tiles and it is pretty cool haven't really even played around with the camera much yet, and I really hope that she gets great results on the auto setting cause that's the only way that's going to work for her lol.
I knew she wouldn't have wifi calling with T-Mobile but no tethering will make it hard. It's something she'll use especially when traveling but that could be a problem if she loses hotspot ability when shutting the phone off to get on an airplane cause for sure she's not going to do the intl sim reset when she turns the phone back on..ever..that would be left to me but if I'm not there hotspot can't be used and so it's almost too much trouble.
My real hope for internet sharing is that you set it and forget it or that it supposed to work with cyan (as the quoted post affirms and maybe 'tai4de2' if he sees this post has an idea) but currently that's not happening with mine.
Any thoughts much appreciated (btw I just ordered and O2 UK prepaid sim on ebay and not really sure what to do with it when it arrives lol) thanks!