Samsung MM-A940

I work for a retail company that sells phones, among other electronics. I was helping a customer who had a nice phone, but it didn't have windows mobile. But it did have MircroSD. He had applications that could block phone numbers, and do other things like edit pictures, and email clients. He had these applications installed on his MicroSD card. How can I install these applications onto my phone. 🙂 does anyone know of any pages that I can get free applications, or paid ones. Either. I think with a Samsung A940 it'll have to be Java based. I am not sure. Help please on the subject matter.