A:AnswerDepends, mostly on which country, as certain counties use different types of cellular technology for voice and data. The best way to find out is look at the major service providers for the country you're curious about, and see if they follow the S8's radio bands.
2G bands GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only)
3G bands HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands LTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 17(700), 20(800), 28(700)
Speed HSPA 42.2/5.76 Mbps, LTE-A (4CA) Cat16 1024/150 Mbps
GPRS Yes
EDGE Yes
A:AnswerI think only black has been reported for unlocked U.S. version that Best Buy will sell. If you want color your choices are carrier or international exynos version which Best Buy will not sell.
A:AnswerYes, the phone will be unlocked. The list of LTE bands is supports is listed above. Ask your carrier for the list of bands they require. If you can't get information from them, you might find information online by searching for "phone network compatibility" in your favorite search engine.
A:AnswerNot sure. We had AT&T and bought from Best Buy so we didn’t have to use At&T’s Pay as you go. If the phone allows TMoblie, then you should be able to do this but check with Best Buy.
A:AnswerHello Nursegirl, I have attached a link below to the warranty of the device.
http://downloadcenter.samsung.com/content/UM/201711/20171130060520658/UNL_SM-G950U1_GS8_EN_HSW_N_7.0_083017_Final_Rev_1.1.pdf
^Britt