A:AnswerEven though it has WiFi-calling feature, for prepaid/no-contract accounts, minutes are still deducted. Wifi-calling is only to improve your signal strength if you are in an area with spotty service.
A:AnswerThis phone performs great with windows 10. I have it already installed and it's brilliant. The only hiccup in the first week of having the phone is that the alarms app has some trouble using custom ringtones.
To get windows 10 on the phone without waiting for T-Mobile's blessing, install the Windows Insider app from the store. You can choose to be on a fast or slow ring. The slow ring has very infrequent updates and you can be rather sure it's stable. The fast ring might push out builds that have more serious bugs.
A:AnswerI can't think of phone without speaker phone, almost every phone has it. This lumia like others has medium range, not the greatest, not the worst. One beautiful thing it has is FM Radio. I love it.
A:AnswerIt will be fine. How you pay your bill has nothing to do with the phone. Even if you have unlimited monthly, limited monthly, daily or pay as you go and pay it with credit card, debit card, prepaid cards, pin codes or you go to tmobile, it will be fine.