What does this carrier report mean for my iPhone 8+?

Hi,

I bought a used iPhone 8+ off craigslist and found out later that it was locked to Straight Talk.

It also had a hardware issue, so I took it to apple. Apple replaced my phone and, surprisingly, I was able to activate it on T-Mobile. I paid for carrier report and it shows "Unlocked: true", but "Next Activation Policy" is still Straighttalk. Does this mean it will lock itself back to Straighttalk if i reset it?

Or is it fully unlocked?

IPHONE 8 PLUS,MM,64GB,SPACE GRAY

Part Description: iPhone 8 Plus

Initial Activation Policy ID: 3003

Serial Number: XXXXXXXXXXXX

Initial Activation Policy: Multi-Mode Unlock Service

IMEI: XXXXXXXXXXXXX

Last Applied Activation policy ID: 3003

IMEI 2: 

Last Applied Activation Policy: Multi-Mode Unlock Service

MEID: 

Next Activation Policy ID: 2360

CSN/CSN2/EID: 

Next Activation Policy: US TracFone / StraightTalk Locked Policy

Bluetooth MAC Address: 

First Activation Date: 12/28/18

Software Version: 12.1.2

Last Restore Date: 12/28/18

Software Build: 16C101

Unlock Date: 12/28/18

Carrier: T-Mobile US

Unlocked: true

ICCID: 

Unbricked: 

Carrier 2: 

ICCID 2: 

Product Sold By: WALMART

Coverage Status: Apple Limited Warranty

Coverage End Date: 05/09/19

Estimated Purchase Date: 05/10/18

Purchased In: United States

Find My iPhone (FMIP) - ON