A hands free cellular phone system combining a full featured cellular phone with a form factor of a conventional audio cassette is provided. Several embodiments enabling real time interactive multimedia applications are also provided. Said hands free cellular phone system comprises a cellular phone device (1) in form factor of a conventional audio cassette (9). Device (1) can be inserted into any conventional audio cassette player (22) to transfer audio content into conventional audio cassette player (22) by using electromagnetic coupling with electromagnetic transducer (28) of said device (1) and electromagnetic transducer of conventional audio cassette player (35). Said device (1) provides a full featured, forward compatible, low installation cost hands free cellular phone system.