Not receiving international texts.

For quite some time now, I have been unable to receive texts from a friend in Canada. I am able to receive calls however.

I've got an N70 on a T-Mobile contract based in the UK. My friend has a LG3200 on Telus in Canada.

It has worked before with my previous phone on a different network, but this stopped working aswell.

Is there something extra that my friend needs to do to be able to send back to me? The 011 thing appears to not work for texts.

Thanks to anyone who replies.