Depends on what your definition of "overseas" is. By only having dual band (850/1900) GSM/GPRS/EDGE and single band (1900) W-CDMA/HSPA, this phone is still basically limited to North, Central and South America. In most of Europe, Africa, Asia and Oceania the GSM/W-CDMA capabilities of this phone will be useless.
If the goal was to make this a world phone, I'm curious as to why they didn't go with quad band GSM/GPRS/EDGE and at least tri-band W-CDMA. Very odd specs on this phone.