I can make sound using SFXR program and it yes which?
squarewave
sawtooth
sinewave
noise
As long as you try your best to get as close as you can to what the Nokia would have sounded like. I believe the best settings would be sawtooth with most of the low frequencies cut out. There are also a lot of free sound resources on the jam's resource page! https://phillipp.itch.io/nokiajamresources