I know this is an old thread, but there may be some hope. Try searching for the Huawei E2131 UltraStick Wireless 3G SD Modem. I'm not sure if this ever sold or not but it's an answer to your question.
I like bluetooth tethering with my iPhone. Has been very handy at times when my home internet has gone down, and I feel more secure using my phone's LTE connection instead of public wifi hotspots while travelling.