Possible to remove country Lock with R -sim?

i heard this case of iphone 6 after flashing or reset device will show country lock and i have try with R-sim its not unlocking dear team any other solution to unlock



Model: IPHONE 6 32GB SPACE GRAY MM [A1549] [IPHONE7,2]
Description: IPHONE 6 SPACE GRAY 32GB-USA
IMEI: 3557874999761
Serial Number: FFPXFGR1HYFK
Purchase Date: 2019-02-16
Manufacture Date: 2018-09-17
Device Age: 1 year 10 months
GSMA Blacklist: CLEAN
Find My iPhone: OFF
Carrier: US TracFone/StraightTalk Locked Activation Policy
Next Tether Policy: 2360
Country: United States
SIM-Lock: LOCKED

Attached Images

• WhatsApp Image 2020-07-20 at 12.02.58 PM.jpeg (84.4 KB)
• WhatsApp Image 2020-07-20 at 12.02.58 PM.jpeg (42.1 KB)