Weird texting problem - please help!
I have a Samsung G600 which has worked fine for 6 months. However, when texting one specific other mobile user around 30-40% of texts don't reach him. The message goes into my sent box OK and if I request a delivery notification it tells me it has been delievered but they are sometimes not being received. It seems to be totally random - doesn't matter whether its a long or short message and I've no way of knowing if he's received it which is obviously highly irritating. This only happens with this one friend (I tried texting another friends numerous times and they all got through fine) and when I revert to my very old Nokia 6230 every single text goes through fine to him. We are both on Orange. He has a LG Renoir KC 910.
I cannot work it out - it can't be him blocking my number because he receives all my texts if I use another phone. My Samsung texts fine to everyone else so that seems to be fine.
Does anyone else have any ideas. Any help would be gratefully received. Its driving me mad!!