Well, hopefully this blog will help to answer most of the questions out there and take some of your frustrations and questions about it.
First, there is a USB 2.0 Micro-B Female (Receptacle) on most, if not all, Samsung Galaxy/Note phones. However, look closely, there are differences.
Samsung Galaxy S2 - I personally have this phone as of today, October 2, 2013. It has a pretty standard USB 2.0 Micro-B receptacle, and it's also MHL compatible, which means that a regular Micro-B Male will fit into it and work fine, but if I want MHL capability, I have to buy an MHL adapter that will work with it. Think MHL 1.0 Here's one from Newegg: Product Link
Samsung Galaxy S3, S4, Note 2 - These all use a special USB 2.0 Micro-B / MHL connector - but if the last one is MHL 1.0, think of this one as MHL 2.0, since it has 11 pins in it. The connector design is a bit different, which also means that the fit is different.
From the image below - you'll see two phones. The top phone is a new Galaxy S4. The bottom phone is a Galaxy S2. The easiest way to tell the difference between the two ports is pointed out by the red arrow. You will see the notch in the MHL 2.0, which you don't have in the MHL 1.0
While a Micro-B will plug into either one for charging, the MHL functionality is different.
MHL 1.0 could be extended with a standard USB 2.0 Micro-B, 5 wire connector, Here's one from USBFireWire.com: Product Link
MHL 2.0 requires a special 11pin connector. The MHL 2.0 (left, below) inserts almost 2mm further than a standard Micro-B (right below) connector. It also looks just a little different - you can see the ridge that fits into the notch that we noted in the receptacle above.
See the image below
In the end, the two are somewhat compatible, but definitely not fully. To extend MHL 1.0, you can use a standard Micro-B 5 wire extension, that we linked to above. To extend MHL 2.0, you need one of our MHL 2.0 extensions, which will arrive mid-October 2013. Product Link to MHL Extensions
