Default How to Force Roaming?

I've spent about 10 hours trying to figure it out, i did figure out how to write prl's but i am still not sure how to force roaming? I just need to tether with a different ip sometimes besides sprint, so not massive data or calls, less than 100mb probably a month. maybe 50mb. But i cannot get either my note 2 or my evo 4g lte to roam i've tried a ton of different things, i've written different prls but i still stay on the sprint network.