asigning specific sound to Text?

[#1]

Hi

I get the phone ring and a ping when got email, but for some reason I do not get a sound from when someone text's me.

Can anyone direct me to the possible answer please?

Edit:-

Sorry just realized I posted in the wrong forum. Doh!!!

It's  obviously phone specific.

[#2]

Moderator's note:

I have moved this to the Mobile forum.

[#3]

Morning @foxleybob, 

Thanks for getting in touch today. What handset are you currently using? -Ashleigh 

[#4]

It's  obviously phone specific.

Possibly text app specific as well.