After a sim card trouble-shooting, a full reset and much research, I have found out that the iPad 3 modem firmware (baseband) is 1.0.10. Which happens to be a very new baseband that does not have much information.
My iPad 1 baseband is 07.11.01 (running ios 5.1) which works great on the 3G here in Japan. After 3 calls to Apple, the only thing I have come to understand is why the charaters on "The Big Bang Theory" like to make fun of the Apple "geniuses."
I believe (I hope I am wrong bc the answers are not in the near future) there are only two things that can happen:
1. Apple updates the iPad 3 modem firmware to allow the iPad to utilize these other 3G carrier.
2. Each individual 3G carrier changes their network setting and/or SIM cards to allow this baseband to utilize the networks???
"It also works on GSM/UMTS worldwide network technologies including HSPA, HSPA+, and DC-HSDPA — the fastest 3G networks out there." Apple might need to update the website.
Specifically, I am trying to use NTT Docomo prepaid sim for iPad operating on:
W-CDMA/HSDPA/HSUPA / 2100MHz/800MHz
Which clearly falls within the iPad 3 specs:
UMTS/HSPA/HSPA+/DC-HSDPA (850, 900, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz)
Anybody out there, please help?!?!?