N.B.
I didn't read all the responses, so I apologize if I duplicate. Both my daughters used pacifier and I didn't want them using one beyond 18 months to 2 yrs, because it really bothered me to see children talking with a pacifier in their mouth...call it a weird per peeve.
Anyway, with both the girls I had friends who had babies around the time I was working on getting rid of the paifier. I told them they were big girls and the new baby needed the pacifier now. We gathered all the pacifiers up and gave them to the new baby together. It worked amazingly well, neither one ever asked for the pacifier again.
At the same time we started a new bedtime tradition of me laying in bed with them for about 15 minutes talking about what she did that day. My oldest is now 9 and because of that tradition we now have great conversations on how to deal with the peer stuff she is starting to encounter. I never realized starting that tradition to help make them feel comfortable going to bed without a pacifier would yield such great communication between my girls and I as they got older!