You can ask for the conversion online. You don't have to telephone.
I decided what I wanted my allocation to be long term, then put all the money into one account until I hit the $10k threshold. Then I pumped all the money into the next fund until it hit the $10k threshold.
After that, I put all my money into one fund until I reached my target allocation, at which time I split my contributions by the target allocation percent.
That way, I got to the minimum fees the fastest possible.