Can't dial out or get incomming calls. my niece was here playing with it and it hasn't worked since

Question edited fir clarity

Ideas here. You can also Google
make model manual
See if it is a an outgoing call barring feature.

https://www.google.com/search?q=I-DECT+Phone.+It+receives+incoming+calls+but+won%27t+dial+outgoing

..

Disconnect all the phones. Then plug in one simple phone to the main incoming phone jack. This is normally a larger box and near the front door or incoming power distribution board. If that works, you have a faulty phone somewhere in the house. If that phone fails, your telco cut you off or there is a line fault.

If you find that there are only a few personalized numbers that you need to call frequently, you can add them to your contacts and let SmartDial find them for you. This is my personal solution about increasing ringtone volume on incoming calls just install a Increasing ring app from app store or play store

abdul Rakib, it seems your green button is very sensitive, make sure you are not pressing twice and if problem persist post more comments for further help.

Hi,
To cancel bared incoming calls on your phone, enter one of the code given below.
##67#, ##21#,##62# or ##61# then okay/send/yes. the phone will be unbarred.
Regards

This might sound strange but have a play with the volume and camera buttons (the buttons either side of the screen). One of the most common causes of non-working keys on the V3 is a jammed volume/camera button.

Believe it or not, I accidentally discovered you have to really press hard on the numbers to dial !!! I guess this happened as one is used to a light touch working on a cell etc

The User Guide will give you all the information

Feature 69 feature.

did u try removing the battery and reinserting after 2 min..

and if already tried,

then try dialing from oter phones, or check the assign tone in ur phone contact from which ur testing to be assigned with some ring tone...