Sorry, I little bit confuse, when you say use data? Did you mean to connect to the Internet? If so you need a device that is capable of accessing Internet connection like smart phone, smart table or Laptop.
If you mean, you wish to know your data usage but you do not have Mobile Phone or computer to use, we can arrange our Account Specialists Team to check it for you.
If you only have a landline No Computer and No Mobile Phone how can you use data?