NoiseMe

From classic interferences to the most surprising sounds that will disturb and alienate the guy on the phone.
Do you want to simulate a loss signal? or do you have another phone call? maybe they catch you in the wrong situation? or you just want to have a big time laughing at the telemarketer guy? With NoiseMe you will always have the right sound for each moment.

You can also record your own sounds.

Note: due to last iOS updates the sounds are transmitted very low during phone calls. It no longer works for that, unfortunately. But it's still a great sound effect library.