Hi there Oyque!
Thank you for posting in Apple Support Communities. It sounds like you are trying to access your calling widgets on the Lock Screen of your iPhone. We have some information that you may find helpful.
To start, thank you for taking a look at our support article: Use widgets on your iPhone and iPod touch Doing this helped give us a better idea of what was going on.
First, let's make sure that you have your iPhone's settings configured to access to you control access information from the Lock Screen.
Take a look here: Control access to information on the iPhone Lock Screen
Once you've completed the steps listed there, go to: Add widgets on iPhone and look under "Allow access to Today View when iPhone is locked"
We hope this helps.
Cheers!