Samsung Galaxy S7 32GB - can't receive texts or calls from new contacts

[Anonymous]

Hi, I wonder if anyone has any advice, my phone doesn't seem able to receive calls or texts from new contacts?  I've been told when people ring me they get a message saying that 'this number is unavailable' and I don't receive any texts sent.  If I contact the person first it seems to work fine but I need to be able to take calls from any number, such as my son's schools and businesses.

I wondered if it could be something in my settings - only allowing contact from known numbers?

I've tried turning the phone off and on again but apart from that I'm stuch, I'm not very technical with phones!

[Bambino]

@Anonymous  See if this video helps.

[MI5]

Have you recently joined o2 and ported your number or changed anything else on your account?

[Anonymous]

Thank you for the video, I didn't know how to check my blocked numbers.  However it has disproved my theory as I don't have any blocked numbers and anonymous callers aren't blocked.

It is quite a new phone but being non technical I didn't keep my old number and manually entered all my contacts. 

[MI5]

Have you enabled "do not disturb" by mistake?
http://www.androidcentral.com/how-use-do-not-disturb-mode-samsung-galaxy-s7