Ringplus has just sent out an email to its customers informing them that they are working closely with other yet to be named MVNOs. Ringplus appears to be working with them to allow you to transfer your service to them seamlessly without even losing your Top Up balance! If you have already ported out however it is too late for you to recover the balance.
Here is a copy of the email that Ringplus has just sent out:
ABOUT YOUR SERVICE
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RingPlus is currently in discussions with other MVNOs (wireless carriers) that are ready to take over your service on their plans. Your Top Up balance will be credited by the other MVNO as a courtesy. Additional benefits will likely be available. If you port out now, you will lose your top up balance. You will be informed on how the switch will be completed as well as the information about the carrier later today. If you are interested in participating in the process, please do not initiate a port at this time. RingPlus and the other MVNO will work out a transition process, and infom you of the details very soon. (Unfortuantely, I you have already initiated or completed a port out, you will not be able to participate in this process.)