Right, but the free at sea minutes can be swapped to credits when upgrading the internet as long as it has not been activated. There is a table for the conversion where 150 minutes = $100 and 300 minutes = $200.
If transferring the 150 minutes is possible, then can you get $200 credit if you upgrade on that account (I assume you do not have to activate the new 300-minute account when doing the transfer?)