the author of this app says:
This is a DTMF tone generator and dialer for your Sony Clie PEG-NR or PEG-T series handheld. To make a call, hold your telephone receiver to the Clie's speaker. You can dial numbers manually or paste them from the clipboard's quick-switch phone pad for dialing alphanumeric phone numbers. This has up to 15 programmable speed-dial numbers and a build-in bad pixel finder.