Phone call problem

[liamtoh1]

I received my Sprint TP2 a couple of days ago and played with the stock ROM for a day. Yesterday I updated (after HardSPL), with EnergyROM.

I was hoping if someone can help with me with this peculiar problem that I have while making phone calls.

All my phone numbers in the contacts are stored as +1 999-999-9999 format.

When I call any number, the phone attempts to dial out, then I get a sound like when the called number is busy and it disconnects immediately (within 3 seconds).

But if the punch in the numbers 999 999 9999, then the phone is able to call the other party correctly. I also tried storing the numbers as 1-999-999-9999 or 999-999-9999. Both these work correctly.

Any ideas why "+" causes the problem?