Hey @khanh129! Welcome to the community. 
We're thrilled that you wish to do so. It may certainly be possible, depending on how you cancelled the account, to restore it.
If you requested that your account be cancelled, we can reactivate it as long as it was cancelled within 60 days. If you ported the phone number to another provider, a new account will need to be created and a new plan selected.
In each case, you would need to contact us here to help you with that or we can send you a PM here to assist you through the community.
I hope that helps!
