how do I know if my iPhone 6s is locked to a carrier?
I bought my iPhone 6s 16gb at Walmart for full price. I activated it myself with straight talk service and I have recently upgraded so I’d like to sell my phone but I need to know: Is it locked to the straight talk carrier? Is it available to use with any carrier? Which carriers is it compatible with? I still have the SIM card and the device is factory reset. Thanks