hi! you can block specific phone numbers with your motorola defy. You can follow these steps here:
Block incoming calls
How to block incoming calls
To block incoming calls, follow these steps:
- From the Home screen, tap the blue Contacts icon.
- Tap the contact that you want to block.
- Tap the Menu key.
- Tap Edit.
- Scroll down and tap the check box next to Send straight to voicemail.
- Tap Save.
well, if you want to know if this stops texts, i believe it doesn't. But if you don't want to receive calls and text from unknown numbers, you may want to consider downloading an app from the android market/play store. One would be advanced call blocker, and you can check for others too. there are some thout would come for free, some you may have to pay for.