Your phone number can be found on the back of the sim packaging. The phone number starts with 07. The sim card is a UK based sim card, hence it will have a UK phone number.
Should anyone want to call you on your phone number, they would need to drop the leading 0 and add the UK country code +44 in front of the phone number,
For example, if the phone number noted on the pack is 07307452691, they would need to dial +447307452691. (To get the + on a mobile phone, press and hold 0 until it turns into a +)
The sim does not allow you to make direct calls or send direct SMS. However, you are still able to make calls and send messages via data based apps such as Whatsapp, Viber, Snapchat, Messenger, Skype, iMessage etc.
However, you are also able to add credit to your Viber or Skype account, which will allow you to make local and international phone calls directly to landlines and mobiles.