Here is a curated list of essential Java apps that run flawlessly on the C2-01. Most of these were downloaded from old portals like GetJar, Mobile9, and Ovi Store (now defunct, but archived online).
Java ME (Micro Edition) was the standard platform for mobile applications before iOS and Android dominated. These apps come as .jar (Java Archive) or .jad (Java Descriptor) files. They are lightweight, designed to run on limited hardware—exactly what the C2-01 offers with its 64MB of RAM and 128MB of internal storage.
The process was delightfully manual by today’s standards:
Some apps required adjusting security settings to “Allow” network access, but that was part of the charm.