it is considered as Bold 4   .
although people always said the Bold 9900 is the Bold 4

Bold 1 = 9000
Bold 2 = 9700
Bold 3 = 9780
Bold 4 = 9790
Bold Touch = 9900/9930
so where should we put 9650 ???
actually , i think Blackberry doesn't mean it would be called like that..

every Blackberry have it own codename..

for example , for Bold Series

Bold 9000 - Meteor
Bold 9650 - Essex
Bold 9700 - Onyx I
Bold 9780 - Onyx II
Bold 9788 - Onyx II
Bold 9790 - Onyx III
Bold 9900 - Dakota [Magnum]
Bold 9930 - Montana