Difference between Xperia M C1904 and C1905 model?

[Tester1]

Hi.

1. Is there any difference between these two models?

2. Does C1905 have USB on the go(unlike 1904, perhaps?)

3. What does it mean that C1904 is 3G and 1905 is 4G? C1904 doesn't support 4G and vice versa?

4. Does having more HSDPA frequencies result in better coverge?

Thanks in advance

[Uliwooly]

1. 3G frequencies
2. They are the same with respect to USB OTG
3. Neither variant is 4G capable
4. turning on 3G will drain your battery faster than 2G 

3G frequencies

C1905: 900 / 2100

C1904: 850 / 1700 / 1900 / 2100

[Tester1]

Do both models have USB OTG or neither one have it?

Why Sony doesn't laud this feature?

Can you name some OTG cables compatible to Xperia M?

Thanks

[Uliwooly]

There are other threads on the same topic

http://talk.sonymobile.com/t5/Xperia-M-M-dual/USB-OTG-SUPPORT/td-p/362830