Problem deleting texts from iPhone 4?

I'm running out of storage on my iPhone, so I decided to clean house. My texts are one of my biggest storage uses, because I never delete them, so I started there. Unfortunately, I've sent and received so many texts from some people that I can't mass delete them. Everytime I try my phone freezes for 10 minutes, crashes, and restarts, with all of the texts still there. I really don't want to delete them one by one… Does anyone have a solution?

Have you tried swiping the messages when your in your inbox?

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