If you want a GPRS / HSPDA / EDGE / GPRS / GSM connection, most mobile providers will sell you a data plan and a PCMCIA card to put your SIM card in and attach your laptop to teh internets. Unfortunately there aren’t that many PCMCIA to USB convertors, nor tabletop PC motherboards with PCMCIA slots. There are now, however, a small crop of Broadband USB modems you can use. These come unlocked and support all bands. If you buy a modem from a provider you should be warned that generally they will be SIMLocked. Also, some come with data plans, but generally you can buy prepaid from a provider as well, with or without the modem. Some come with external antennae to increase the range, some don’t.
and the 3.7Mbps, 7.2 MBps ready modem
Going for GBP 198.58 and GBP 210.33 incl. VAT respectively
In the Netherlands Vodafone and KPN both use Huawei modems.
Vodafone is throwing out the E220
and is now releasing the E270 (or the E272 which is supposed to be an upgrade of the E270)
KPN also uses the E272 / E270.
Unfortunately I can’t find any information on buying Huawei products by themselves.
Sony Ericsson is launching the MD400 / MD400g modems. The g version includes a GPS Receiver.