Look at your SIM card and verify the cell phone network who issued it
Verify that you have a current cell phone service plan and compatible phone associated with that network
Call the cell phone network and ask to have your SIM card activated.
How do I register an unregistered SIM card?
Where did you purchase it? You'd better consult the SIM card retailer to get the information:
- Who is the SIM card's ISP (If you know it, ignore this step).
- Make a telephone call to the ISP people to activated.
- Or go to the ISP business hall to activate.