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The 735 has these bands

CDMA network bands: BC1 (1900 MHz), BC0 (850 MHz)

• CDMA max data speed DL: Rev 0 /A 2.4 Mbps /3.1 Mbps
• CDMA max data speed UL: Rev 0 /A 153.2 kbps /1.8 Mbps

Whereas the 950/XL does not and like Tidbits said this topic has been beaten to death.  Take some time and read the posts here.