For years, some foreign carriers and governments had blocked any change in the convention.

Chiming in with dissatisfaction at the fact that the carriers can still block this.

If a carrier blocks an update, it will not become available through Zune.

I knew this would happen the day msft said carriers could block updates.

This would mean, in turn, that a carrier could block an update for three months, and that's not an attractive proposition at all.

Add me to the list of those that are wondering if the carrier can block updates for an unlocked phone.

The received carrier blocked the oscillations, allowing strong local stations to be received clearly.

No carriers "may block, choke, reduce or restrict traffic in any way," the agency reiterated.

From reading Diego's answer in the screengrab, it would seem that carriers can't block updates, only delay them.

What this doesn't mean is that a carrier can't block some users from upgrading their phones.