Default [Q] want sms and mms over data

I am very frustrated. About to go over text limit but have unlimited data on Verizon. Group text is killing me. Verizon has quite the scheme when it comes to how many texts that takes.

My need. An app that combines google voice and whatsapp. It sucks google stopped and seems to be blocked from doing mms.

I am all for and try to use alternatives whenever I can but you can only ask so much of other people.

How can I sms, mms, group, picture, video or whatever just using my data? Why is there nothing like imessage?