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its a slower connection speed so means downloading apps for example or browsing will be slower...but try it anyway it should be ok for normal everyday use. I think the only time you will really notice it is when downloading attachments or apps.
Thats good news, I work in an area where 3g coverage is poor and I have had reports of people not able to get thru to me at times. On my old (non smart) phone I cured this by using 2G only, hey presto, every call came thru. If the only effect this will have on my BlackBerry will be slightly slower web and email I will do this.