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 Originally Posted by kchan283
when I bought US pre2 I could not get 3g network in UK. I assume its same for pre 3.
Correct, the North American GSM Pre 2, Pre + and Pre - devices have dual band UTMS on North American UMTS bands 850 and 1900. The EU GSM models of those devices have dual band UMTS on European UMTS bands 900 and 2100. No way 3G in one region is going to work while using a device from the other region.
Pre 3 and Veer are different. They have tri-band UTMS instead of dual band radios. The EU models have both the EU bands listed above, 900 and 2100, plus 1900. The North American models have both the NA bands listed above, 850 and 1900, plus the 2100 band.
This allows the devices to function more like world phones, but without the higher cost of adding a quad-band UMTS radio inside. They will work in most country's worldwide, although there are exceptions. The 3G HSPA+ connectivity may be inconsistent due to the single UMTS band utilization. The Pre 3 and Veer fall into this category because they are tri-band UMTS devices.
For example EU 3G tri-band UMTS devices with only 1900 band functionality when used in the North Americian region will generally work just fine outdoors and in metropoliton areas, but will not have very good signal strength when used indoors due to the 1900 band's poor building penetration.
Often cell sites are built out initially in rural areas with equipment capable of communicating on one of the two regional bands with the second band added during future upgrades to the network.
Finally, some carriers will use one band for data transfer upload and the other band for data transfer download. This renders out of region devices with only one working UMTS band non functional for 3G UMTS HSPA+ connectivity.
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