When the iPhone was first released, it came in 4GB and 8GB varieties. This internal memory allowed users to store a high number of text messages in the "Messages" application (initially, up to 1000, now up to 75,000). Because of this, a user can end up with a ton of old conversations stored in the "Messages" application. If you are looking to clean up your texts, you can easily delete entire conversations with a single tap.
Instructions
1. Open the "Messages" application on the iPhone 4's home screen. If the "Messages" app opens to a single conversation, tap the "Messages" back-arrow in the upper-left-hand corner of the app to view all conversations (listed by contact name).
2. Tap the "Edit" button in the upper-left-hand corner. A red circle icon ("Do Not Enter" symbol) will appear to the left of each conversation.
3. Tap the red circle icon. A "Delete" button will appear to the right of the icon. Tap the "Delete" button to delete the entire conversation with the selected contact.
4. Repeat Step 3 until all messages are removed from the "Messages" app.
5. Tap "Done" in the upper-left-hand corner of the application when finished.
Tags: Messages application, upper-left-hand corner, circle icon, Delete button, delete entire, icon Delete, icon Delete button