[Q] Is wifi hotspot standard Android feature?

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My Nexus One has it enabled as a standard feature, but I understand it may be disable by the carrier.

If I get a sim-unlocked Android phone, can I count on wifi hotspot being available, or do I need to get a Nexus, root my phone, install custom firmware, or do other additional steps?

yes wifi hotspot is standard Android feature but the carrier can't turn it off except if the phone was locked already from the provider