Not possible to make normal phone calls but you can use facebook messenger, whatsapp etc to make calls over your data connection. These would be free if connected to wifi or use your data allowance if not.
Chargers can be purchased from ebay, amazon, market stalls etc and are just standard micro USB connections.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
Please select the post that helped you best and mark as the solution. This helps other members in resolving their issues faster. Thank you.