This is for my website http://www.ringercentral.com I got a 30 Euro voucher for Adwords that converted to $55 USD I made my Adwords campaign. This is what I thought would work:
$55 USD won't last long unless you target your campaign. Be sure to restrict you ad to countries that have cell phone service and also restrict your keywords. For example, you will get a lot of traffic with the words free ringtone but few conversions. Instead try [free ringtone] (note the brackets). You will get more qualified leads and a higher conversion rate at a lower overall cost.
The brackets, is that some form of a search agent or is that just part of the keyword? If it's not part of the keyword... why is that effective?