Depends if that s4 is cdma or gsm... I would recommend sticking with gsm for byop unless you absolutely need verizon... with at&t and tmobile sim cards on straight talk you still get 4g lte service... and unless they have changed their cdma byop in the last couple months you cannot do anything beyond 3g on cdma byop... a friend of mine just picked up a used AT&T Samsung Galaxy Express for $115 and its one hell of a phone for the money if your looking for similar features to the S3/S4's... I would recommend to anybody looking for a solid android phone on a reasonable budget to use on Straight Talk or Net10 BYOP check it out... oh did I mention it runs 4.1 jelly bean official? And I think its an AT&T Go Phone so it might not be too pricey to buy it brand new.
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