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.
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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.

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 -
More likely to work -

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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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