text inbox full but deleting texts hasnt helped.

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I did have 100s but I've deleted them all and im still getting messages saying an incoming text has failed because box is full.

Do i have to delete them from deleted too? if so how?! Or something else? can anyone help?

Its an old Samsung Galaxy Ace

Sounds like they are still in memory somewhere.

History Eraser app is quite small and handy for deleting various things. Try using that to remove messages and call logs plus clearing cache.