From Birmingham (UK) to Dubai terminal 3
From Dubai to Ahwaz(Iran) terminal 2
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Since you are in the UAE, you'll have to pay in Dirhams, as that is the currency there.
Based on your previous question however, you should know there's a free shuttle service provided by Emirates for customers connecting to FlyDubai
At the Dubai International Airport, Emirates also connects you by coach, from arriving in Emirates Terminal 3 right through to your departing gates in Terminal 2
I used http://kiwitaxi.com/UAE/Dubai+Airport and it was possible to pay in dollars. But I know all services in UAE are paid exclusively in their national currency Dirhams.