It seems that the days of silly iPhone tethering workarounds may be coming to an end (for those who are willing to pay for it.) Rumor has it that AT&T might finally launch an iPhone tethering plan, which would allow owners of the iPhone 3G to use the phone as an Internet access point. Now, we know that MacWorld 2009 kicks off tomorrow, but that doesn’t necessarily mean that the tethering plan will be announced there, but as our friends at Ars bring up, the functionality would likely require an iPhone OS update, and that in and of itself might be newsworthy enough to be mentioned tomorrow morning, if all of this comes to fruition.

The costs may outweigh the benefits, depending on your travel schedule and how much you’d plan on using the tethering option, as we are expecting the cost to be at or around $30 per month. A little spendy, we think, unless you plan on using it frequently - but then the issue of the iPhone battery comes in to play. Sure, you can plug it in to a USB port, but unless your notebook is plugged in to a power source, then you are using up extra notebook battery life. Or, you could just use a Mophie Juice Pack.

The fact that there was never an official tethering plan for the iPhone has always been odd to us, since other AT&T smart phones have those plans ready from the get go. Let’s hope this rumor rings true.