Galaxy S2 not recognized in Apps download

[EricFish]

Hi
I'm new to smart phones and trying to find my way around them. I had an Orange San Deigo phone and purchased a few apps for it and they ran very well (It's a pity the phone didn't work properly) I was upgraded to the Galaxy S2. I have now tried to install the apps on to the Galaxy but the Galaxy is not recognized in the download screen. What am I doing wrong please

[greenman]

If you cannot find the apps in the Play Store then they are not appropriate for the S2.

[RichH]

What apps are they and make sure you have logged in on the S2. But as above, may not be compatible with S2....