A:AnswerThe s8+ is slightly bigger...and the regular s8 is waterproof as I understand it. My 19 year old son opted for the s8, my husband and I got the s8+. My son is a college student and didn't feel like the extra size was something he needed as he's on the go alot...my husband and I are in LOVE with our crystal clear large screens!
A:AnswerChances are if you have the Samsung for life plan when you send the phone back after your upgrade they may not accept it or may charge you a fee to fix it. Other than if you just want to upgrade to a new phone you are always allowed to do that, it just depends on any upgrade fees and how much you may have to pay out of pocket. The short answer is you can upgrade anytime you want.
A:AnswerIt works if you can get it unlocked from Sprint. Once unlocked you can flash the US unlocked firmware (search for instructions on xda) to remove bloat and enable tmobile Wi-Fi calling and Volte
A:AnswerYou can talk and surf as long as the phone is connected to WiFi. You cannot talk and surf at the same time if the phone is connected to mobile network only.