Was Looking & Reading on Droid Life and came across this Verizon has Released or is going to release SOON.! Push to Talk Plus this feature was on a good share of the Flip phone's Verizon sold in the past and it is kind of Nice to see it now available for our Smartphones...
From what I could Tell most of the New smartphone that are out.. can use this new feature, If you'd like to see if your phone is one of one's follow the Link and have a Look.. Enjoy 
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Note: there is a $ 5 Dollar charge for the Service..
Verizon’s Push to Talk Plus Now Available for Galaxy S5, DROID MAXX, and More | Droid Life