Thanks. It is my first cell phone. So I did not know of terms like "key lock." And I bought it used. Therefore, no manual.

You can download the manual for the Nokia 1661 at:
https://www.speakout7eleven.ca/asset/upload/phone-user-guide/SpeakOut-Nokia-1661-User-Guide.pdf

Since you're new to mobile phones, the manual is worth reading. You'll probably learn about other cell phone features that are "obvious" to long-time users, but will be news to you (as you discovered with the "key lock" feature, which all cell phones have had for many years).

Have fun!

Setting the automatic key lock
To set the automatic key lock, perform the following steps:
1. At the main screen, select Menu.
2. Scroll to and select Settings.
3. Scroll to and select Phone settings.
4. Scroll to and select Keyguard settings.
5. Select Automatic Keyguard.
6. Scroll to and select On.
7. Enter the time delay.
8. Select OK.

Manually locking the keypad
To manually lock the keypad from the menu, perform the following steps:
1. At the main screen, select Menu.
2. Press the Star (*) key.

To manually lock the keypad, perform the following steps:
1. At the main screen, select Go To.
2. Scroll to and select Lock keypad.

Manually unlocking the keypad
To manually unlock the keypad, perform the following steps:
1. Press the Left Soft key to select Unlock.
2. Press the Star (*) key.

Your phone sounds like it is acting normally.

The only ways calls are getting in are when it is on, or in sleep mode (phone on, screen goes black after 3 seconds).

Thanks.