Where on Earth is the apostrophe when sending texts? It's not with all of the other punctuation marks on the number 1 key. I have had my phone for a while now and got the other half one too. I can't find the darn thing.
However, I suspect that it might be hidden away in 'Symbol Mode'. (The manual doesn't illustrate the range of available symbols).
Try pressing, and holding, # until 'Sym' is shown. Use the navigation keys to scroll to a character set and then press the relevant numeric key to enter the required symbol.
I have a Samsung E-250 as well.
If you use ABC or Abc mode for texting.
Press 1 twice, this gives you a comma
The full list of characters for the 1 key are:-
Full stop,comma,dash, question mark,exclamation mark,
@,colon,brackets, slash(/)