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How does the cellular phone company charge for IP-based calls?

If I am using my cell phone as I travel and suddenly it accesses an IP network or starts using SIP, how does my service provider know where I am at to charge me any applicable fees?

If I am using my cell phone as I travel and suddenly it accesses an IP network or starts using SIP, how does my service provider know where I am at to charge me any applicable fees?
They can tell by the tower that you are connected to. If you are using IP, you are still connecting to a tower. This is also how they can tell where you are when you call 911.
This was last published in October 2006

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