Mr. Number

• With more than a million downloads as of publication, Mr. Number is a popular application with advanced tools to help you screen your phone calls. Mr. Number’s features include call- and text-blocking by number and area code, automatic reverse phone number lookup for numbers you don’t know, an address book and crowd-source integration that lets Mr. Number users share contact information for unwanted telemarketers and spammers. Mr. Number is a free application, although after the first month of use its reverse phone number lookup feature costs $1.99 per month as of time of publication. Mr. Number is 643 KB in size and requires Android 1.6 or later.
  
  

Full Screen Caller Pro

• Full Screen Caller Pro displays a large, high-quality photo on your Android-powered device when you receive a call, make a call, get an SMS message or miss a call. Large, easy-to-use answer and decline buttons pop up at the bottom of your screen when a call or message comes in, making it easy to decide whether you want to receive it or not. The application lets you choose between five different layouts and themes and includes a search function. Full Screen Caller Pro is 632 KB in size, costs around $3 and requires Android 2.1 or later as of time of publication.
  
  

Call Informer

• Call Informer is a robust call-screening application that displays a wealth of information on-screen when you receive a call or text message. The app uses information from your address book to display the name, nickname, job title, city, state, country, company and group association of the person trying to contact you. Call Informer is 259 KB in size, costs around $1 and requires Android 1.5 or later as of time of publication.
  
  

Full Screen Caller ID LITE

• Full Screen Caller ID is exactly what its name says it is – a caller ID app that displays a screen full of information about your incoming callers. The app’s features include customizable screen layout and content, the ability to incorporate pictures for callers in your address book, video caller ID functionality, automatic blocking of certain numbers and text-to-speech capabilities. Full Screen Caller ID LITE is a free application that’s supported by ads. The app is 1.3 MB in size and requires Android 1.5 or later as of time of publication.