What OS and programming language was used on old cell phones?

Question

Now a days if a cell phone isn't an iPhone it runs on the android os if I'm correct. My question is pretty broad so I'll narrow it down to these two old cell phones to be exact. What operating system and programming language is used on the LG Rumor 2. I'm not sure what model the second phone is but it's pretty similar to the old Nokia 3310. What operating system and programming language was used for old Nokia phones similar to the one mentioned above?

Answer 1

Nokia 3310 Symbian OS



LG Rumor 2 possibly Brew MP (by Qualcomm)

Answer 2

Java is not an operating system. Java is a computer programming language.

Answer 3

java is the operating system for older phones. Entire firmware was programmed with Java .