Leaving aside for the moment the exclusion of Jerusalem from the freeze, the fact is that Netanyahu cannot freeze settlement activity. The radical settlers will ignore him, and he will be afraid to do battle with them on any major scale. While all the settlements are illegal, the ones that Israel itself declares to be illegal will continue to proliferate and expand.
Three Turkish soldiers killed, 14 wounded in PKK attack in southeast, army says (Reuters)
from the article: Netanyahu declares 10-month settlement freeze 'to restart peace talks'