Sending scheduled message is useful in different situations :

-) The birthdays, the holiday season.
-) When you're busy
-) And many other situations ...

Want to compose your SMSes using real keyboard instead of using your cell phone's tiny keyboard ? Are you mostly behind the PC and wants to get notified when you have an incoming call/sms right at your PC ? Want to compose SMSes from work/school using your PC? Don't want to spent money paying for such apps? If so, Brenk PC Notifier is what you want. Its free! (supports android 1.5 and higher)

Block unwanted calls!

Do you know how many SMS you have sent this month? Threaded message dialogs don't make counting easy. This app will help you tracking how many sms you have sent and received. It even provides counting for the past months. No more busting your sms quota!
Note: Works only with the build-in android sms app!
Icons by Glyphicons.com used under CC BY-ND 3.0

Android app for sending jokes to any mobile phone via SMS, you can send SMS as anyone.

This application shows additional callers country or city and other available information about incomming call.

WOW, NO ICON, NO OPEN BUTTON!

Welcome to Shady SMS 3.0; Shady SMS is by far the best dial to launch secret/hidden messaging application on Android. Once opened there is no icon and no open button!

Phone Tracker

GoJack allows you to send free SMS messages from mobile phones, freely, without any limitation and for ever.

One of Top500 App: 4.9★Rating, Full Featured, No Ads: Send Text/SMS after rejecting/declining incoming as well as ★Outgoing calls, Fast Redial, Template+Buddy pairs. Bunch of features in one app. One of Top 500 apps in its category on Android Market.

Make new worldwide friends now.

No more no-show clients! Book your clients and have text messages (SMS) automatically sent to them before their appointment.

Dribble Online Dating - never miss a message or invite again! Be connected to the Dribble Online Dating network wherever you are - South Africa, Johannesburg, Durban etc. Free video chat and messages between members. Singles and couples are waiting to chat with you now.
Visit www.dribble.co.za

With Faces app you can upload pictures to your profile, receive notifications and locate members on the map.

This application includes two features that will allow you to make jokes to your friends to invent situations ...

☆ Fake SMS:

Allows you to create any type of fake SMS specifying the date, time, message ...

When get the message it is as if it were a real (Notifications, Messages opens the application on your laptop at a click, vibration, ring ...).

☆ Edit SMS:

Allows you to change an existing SMS.

A real-time walkie-talkie application.

Swingers Heaven for Android makes it easy to join and upload photos or videos to your profile, also you can read and write your messages, and locate other members on the map.

Swinging Heaven for Android makes it easy to join and upload photos to your profile, also you can read and write your messages, and locate other members on the map

Radio online 170 stations at one click!
5 countries for you.
Russian, Ukraine, France, Germany, USA

This program is primarily intended for the hard of hearing but also for people without hearing difficulties. If you return your device to face against the ground, you cut the ring, You will be notified with the flash of the camera.

Ice cream Sandwich not supported yet !