whıch one ıs true ?

Question

over 200 mıllıon people ..........theır own mobıle phones by the end of 1197,and estımates................mobile users at 400 mıllıon by 2000and one bıllıon by 2008.
a)wıll have had-number
b)had had - number

Answer 1

b.
I assume you meant 1997 not 1197. Either way, that was in the past, so you would say "people had" .

Answer 2

b.