While experienced with phonegap and xcode, I\'m new to android. I have installed phonegap 3.0 ...
npm install phonegap
phonegap --version
3.0.0-0.14.3
Simply open your AndroidManifest.xml file and set minimun and targeted version. In your case 18.
Same answer to question Phonegap 3.0 CLI issue android target number in build app.
AndroidManifest.xml file is located in: YOURPROJECT\platforms\android. If you need more assistance ask, will try to help you.
Post your AndroidManifest.xml file so I can check.