You can use this app to start and stop impressions and to unarchive campaigns.
How do I start and stop impressions?
You can start and stop campaigns, ad groups, ads and keywords. In the corresponding list, find the appropriate element and tap Launch.or
How can I unarchive a campaign?
In the campaign list, find the one that you need and tap.
After you unarchive the campaign, it is marked "stopped"; you have to tap Launch if you want the campaign to run again. Additionally, the campaign may automatically be sent for re-moderation. In this case, the ads will not be served until they pass moderation.