A:AnswerMine only got warm at the back the first time I turn on the phone while it was upgrading to 7.0 nougat and after that it's running normal, it never get warm again..
A:AnswerThe current security patch is as of Dec 1, 2016 not monthly like it should be. Might be on quarterly cycle so next patch should be in March, 2017 - hopefully. Still on Marshmallow with no Nougat in sight. Phone is already outdated.
A:AnswerYes it will work in all countries that have the below frequencies:
Frequencies & Data Type
2G GSM: GSM850,GSM900, DCS1800, PCS1900
3G UMTS: B1(2100), B2(1900), B4(AWS), B5(850)
3G TD-SCDMA: B34(2010), B39(1880)
4G FDD LTE: B1(2100), B2(1900), B3(1800), B4(AWS), B5(850), B7(2600), B8(900), B12(700), B18(800), B19(800), B20(800),B29(700), B30(2300)
4G TDD LTE: B38(2600), B39(1900), B40(2300), B41(2500)