nope, I flash phones on a daily basis, the s5 can be flashed to pageplus or any other carrier that will accept the ORIGINAL ESN onto their database. you cannot change esn on the s5 due to newer technology IMEI certification. I may be wrong about the exact technology but I do know that the sprint s5 is not going to Straighttalk. I flash s4 note 3 and alotta other phones to straighttalk, but not the s5.