There are 4 international models of the GN2, and approximately a dozen models designed to meet the needs of various network providers around the world.
I believe they have very different radio hardware & I don?t believe that they?re interchangeable (but I?m new to android) ? so don?t flash a rom from N7100 onto an N7105.
Wikipedia has a nice table that explains how they differ:
Samsung Galaxy Note II - Wikipedia, the free encyclopedia
I guess the trick is to match the characteristics of the phone radio with the characteristics of the networks you?ll encounter:
e.g. provided you have the right simcard the international N7100 can:
- use 3G data from 4 very common frequency bands (850 MHZ, 900 MHZ, 1900 MHZ, 2100 MH);
- fall back on 2G GSM networks on 4 very common frequency bands (GSM 850, GSM 900, GSM 1800, GSM 1900).
- but doesn?t have the chip to access high speed LTE data.
- I believe that Samsung does the updates for the international phones.
- it?s probably the easiest phone to get software for ? because it?s generic.
If you get a phone from a carrier like T-mobile you benefit by:
- 4g coverage in areas with 700mhz.
- Much faster 3g speeds in areas with 850mhz coverage
But you lose the flexibility of:
- Access to AT&T?s 2100mhz 3G network if you switch companies.
- Have to fall back on really slow 2G coverage in many areas around the world.
- Lose updates from Samsung OTA.