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These questions will help narrow down how your update - when ready! will be delivered.
Don't worry you will still receive the update due later this year from Vodafone - you don't even have to have a voda sim in the phone - you could have no sim and it will still receive the update. 
Sorry, I should have been more specific in the first place. The phone has the google logo on the back, and Vodafone on the front. I bought it second hand to use with my existing SIM. That's with Talk Mobile who use Vodafone's network.
I can't imagine them sending any upgrades though, they don't officially support that phone.
Here's why I suspect I won't be receiving any OTA upgrades
I wonder if one of these would work... Is the Vodafone unit physically different from the others?