i710 Nextel model does have the qwery keyboard.
I did find out there is an keyboard for Erricson model
http://cell-phone-accessories-wholesale.com//index.asp?PageAction=VIEWPROD&ProdID=1397&MMP=1
And there's an BlueTooth keyboard for cell phones and PDAs, only I'm not sure which cell phone they are compatitable with
http://www.celphoneaccessories.com/index.asp?PageAction=VIEWPROD&ProdID=12094&MMP=1
