▁last ▁model ▁released ▁in ▁the ▁early ▁Black Ber ry ▁form ▁factor , ▁and ▁was ▁the ▁first ▁Black Ber ry ▁model ▁with ▁Bl uetooth . ▁The ▁ 7 2 9 0 ▁was ▁also ▁the ▁first ▁quad - band ▁Black Ber ry . ▁ ▁An ▁aber r ation ▁in ▁this ▁list ▁is ▁the ▁ 7 2 7 0 , ▁the ▁first ▁Wi - Fi ▁Black Ber ry , ▁released ▁later . ▁It ▁is ▁built ▁into ▁the ▁old ▁form ▁factor ▁in ▁the ▁same ▁ve in ▁as ▁the ▁ 7 2 0 0 ▁series . ▁ ▁First ▁Sure Type ▁models ▁( 7 1 0 0 ▁series ) ▁ ▁R IM ▁expanded ▁the ▁market ▁by ▁introdu cing ▁the ▁first ▁Black Ber ry ▁models ▁without ▁a ▁discrete ▁Q W ER TY ▁keyboard , ▁in ▁the ▁c andy bar ▁form ▁factor . ▁They ▁developed ▁a ▁predict ive ▁text ▁technology ▁called ▁Sure Type ▁with ▁a ▁Q W ER TY - like ▁layout , ▁using ▁two ▁keys ▁per ▁button . ▁By ▁using ▁only ▁two ▁letters ▁per ▁button , ▁rather ▁than ▁three ▁letters ▁per ▁button ▁as ▁in ▁T 9 ▁using ▁ten - digit ▁key p ads , ▁predict ive ▁text ▁accuracy ▁could ▁be ▁improved ▁dram atically . ▁The ▁use ▁of ▁a ▁Q W ER TY - like ▁layout ▁took ▁advantage ▁of ▁people ' s ▁memory ▁of ▁the ▁computer ▁keyboard , ▁since ▁each ▁button ▁was ▁roughly ▁relative ▁to ▁each ▁key . ▁At ▁the ▁same ▁time , ▁the ▁size ▁of ▁the ▁Black Ber ry ▁could ▁be ▁dram atically ▁reduced , ▁as ▁key boards ▁only ▁needed