VirginMobile Inner Circle Plan Bug?

VirginMobile is offering a new plan called Inner Circle where you can get unlimited nights and weekends for 70 cents a day to 3 of your closest friends - all other calls are at 10 cents p/minute.

However, the other day I noticed that when my account reached a balance where it could not charge the daily 70 cents (like 45 cents) something wierd happened...While it may not allow me to make calls to anyone outside of my Inner Circle phone numbers, I have been able to make unlimited calls to my Inner Circle friends without VirginMobile charging me. This has been going on for weeks. Essentially it's like having a free hotline phone to 3 of my closest friends.

Has anyone else experienced this?

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They may let you go negative for this. Then when you refill they may deduct accordingly.