Re: unlocked lumia 1020 for international use tethering, local provide does not block
Why did you buy an AT&T branded phone for use in another country?
Tethering is problimatic - there are hundreds of reports of tethering being locked to AT&T service on AT&T branded WIndows Phones, with some odd workarounds that I have found when searching for an answer.
This post and this thread seems to summarize the various options:
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