I have a view setup were "call sign 1" is grouped and then grouped by "Call sign 2". This allows me to see when mutable submissions of the call sign have been submitted to my custom list. However, I really only care if there are more than one submission that links two call signs to each other. How do I get the view to only show groups of 2 or more?
If this is not possible is there at least a way to sort them were call signs that have the most submissions show at the top of my view?
Go in Modify View and check the settings under Group By - try changing it to descending and see what happens. 
When you are using Group By it overrides the usual Sort By settings. BTW - I'm using SP2013.
As for sorting by the grouping with the most items under it, you could create a new column which counts items in that grouping - you could use a calculated column for this. Once you have a value in the new column you can configure the view to sort by the NewColumn value in descending order.
You might be able to filter out any groupings that have less than 2 by filtering on NewColumn not less than 2.
