How to access a usb port as a com port

I have a legacy program that uses a dial up modem to upload information to the bank.  It will only access COM ports.  I need to give the user the capability to dial into the bank from a remote location that does not have a phone line.  So I researched how to do this and found that the iphone can be tethered to the computer to be used as a modem.

Is anyone familiar with this concept and it's implementation?

But this setup brings up the question of how I would access the iphone (modem) as COM1-4?  I welcome any advice.
jjackson2004Asked:
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Dave BaldwinFixer of ProblemsCommented:
You would only be able to do that if the iPhone software installs a COM port driver.  But maybe not even then if the legacy software talks directly to the hardware like so many of them did.  In that case, you need to install a COM card that the software can talk to.
RayData AnalystCommented:
I could be mistaken, but I am relatively certain that you can't actually do that with a newer iphone.  Even if you had an older iphone with the old connector style, it would still require custom built connector and jailbreak software.

Edit:
You could use something like this to work with the existing modem configuration.  In this way your would appear to have your regular old phone line.

Cheap - http://www.amazon.com/Cobra-PhoneLynx-Bluetooth-Connection-System/dp/B0043D2IBE
More likely to work - http://www.amazon.com/Xtreme-Technologies-BTTN-Bluetooth-Gateway-Black/dp/B0018NWQPK

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jjackson2004Author Commented:
This seems like a stupid question, but today's advances amaze me.  Would there be some way to do this with a mobile hotspot?
RayData AnalystCommented:
Assuming your current device requires a com port to "dial out", no sir.  The only way I know of to provide that is something like those 'boxes' I listed earlier (certainly there are many different ones on the internet other than the two I linked).
jjackson2004Author Commented:
My apologies, I forgot I had this question open.   I will close it now as I have decided to go in a different direction.
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