The Mini Boombox GSM Cell Phone is a slider phone with built in MP3 player, 1.3MP camera, voice dialing, SMS/MMS messaging and WAP Browser. The handset also offers 256MB built-in memory for your music and a microSD card slot (up to 4GB). It is an unlocked quad-band GSM cell phone with no included SIM card. The phone will not work with Verizon or Sprint. However, you can buy a pre-paid SIM card from T-Mobile or AT&T/Cingular. The Mini Boombox GSM Cell Phone retails for $150.