Fix 'File Too Large To Be Saved' error. (Nokia Mobile Tutorial)

You may have noticed that, when you try to install a large .jar file on a Nokia, it doesn't install and says, The application cannot be installed, because the installation file is too large for your device. or File Too Large To Be Saved or something related to the size of the app.
I found out a way to bypass this limit.

Fix 'Invalid Application For Update' error (Nokia Mobile Tutorial)

Sometimes, when you try to download a newer version of an app on a Nokia mobile phone, it successfully downloads but says Invalid Application For Update when you try to install it. I have found some fixes for it.

Send a free "Please Call Me" message on STC network. (Nokia Mobile Tutorial)

Many people ask this question, How can I send a "Please Call Me" message to a friend with my mobile on STC network?
I couldn't find any good tutorial on the tutorial on how to do this, so I decided to make this guide.