MODEMY

SIERRA:
SIERRA 880: P--/Q7200/ d8/u5/ Q/850/1900/2100/GPS
SIERRA 501: P&E/Q6290/d 8/u6/ Q/850/1900/2100
SIERRA 503: P&E/Q8200/d14/u6/ Q/850/900/1900/2100
Compass885: USB/7201A/ d8/u5/ Q/850/1900/2100
Compass888: USB/Q6290/ d8/u6/ Q/850/1900/2100
Compass889: USB/Q6290/ d8/u6/ Q/900/2100
SIERRA 301: USB/Q6290/ d8/u6/ Q/850/2100
SIERRA 302: USB/Q6290/ d8/u6/ Q/900/2100
SIERRA 305: USB/i8040/ d8/u6/ Q/850/1900/2100
SIERRA 306: USB/Q8200/d14/u6/ Q/850/1900/2100
SIERRA 307: USB/Q8200/d14/u6/ Q/900/2100 
SIERRA 308: USB/Q8200/d14/u6/ Q/850/1900/2100 
SIERRA 310u:USB/Q8200/d14/u6/ Q/900/1900/2100

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Q7200 = Chipset - MSM 7200 Chipset
P = PC Card (Type II PCMCIA)
7201A = Chipset - MSM 7201A (Upgradeable to Category 6 (5.76 Mbps))
i8040 = Chipset - ICERA Livanto® ICE8040
Q8200 = Chipset – Qualcomm MDM 8200
d8  = HSDPA Category  8 ( 7.2 Mbps downlink)d14 = HSDPA Category 14 (21.1 Mbps downlink)
u6  = HSUPA Category  6 (5.76 Mbps upload)
850  = UMTS  850 MHz bands
900  = UMTS  900 MHz bands1900 = UMTS 1900 Mhz bands
2100 = UMTS 2100 MHz bands
Q = Quad band GSM/EDGE: 850/900/1800/1900 MHz