how to know if your sim is registered

How To Know If Your Glo Sim Is Registered.
Send REG to 3456 as a message.
If your line has been registered, you'll receive a message in this
format Your SIMCARD +2348071111111 has been registered. Thank
You!
How To Know If Your MTN Sim Has Been Registered.
Send REG to 789 in a message.
After sending the text to 789 with your MTN SIM card, you should
get a reply confirming or denying that you have been registered. If
your sim have been registered, you will get a service message
saying "Your number has been registered. Thank you!"
If you are an Airtel or Etisalat Subscriber, You still have to Chill as
no Facility has been Created for Such Presently.
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@ Asawo you are so informed, how did you get your information ?

Did you believe i checked mine now and is not register which i believe i register it last year at Yaba.....

Thx for the update

You have to re:register again