I had same battery drain problem on two phones: J5 and S6. Both at the same time and for a week. I tryed averything anybody on the internet has suggested. For a week I was just reading forums about this issue. My battery was drained at the rate of 10+% per hour. Two apps that used the most battery power (each 40+%) were messages (Android) and cell service. At the end I deleted Google (Android) messages app and setup Samsung messages app as default. Now my battery lasts again longer than 2-3 days without a charge on light use. My guss for reason why this was happening is that Verizon switched to VoLTE and messages app could not figure that out and kept looking for message in the old location running radio all the time? Just my guess.
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