If you swap the phone instead of activating it..You will be able to keep your 25$ plan
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The information in the following FAQ that Virgin Mobile USA provides should answer your question definitively. You should go by Virgin Mobile's response.
Learn about new Beyond Talk device upgrade rules http://virginmobileusa.custhelp.com/app/answers/detail/a_id/5667/
"...The following smartphones launched before May 1, 2012 and are therefore not subject to the new device upgrade rules at this time: Venture™, LG® Optimus™ Slider, HTC® Wildfire S™, Motorola Triumph™, LG ® Optimus V™, Blackberry ® Curve™ 8530."
Only the Venture is still available on this website. The other phones may still be available at stores or online. Click 'Find a Store' at the top of this page for nearby stores or check their online website.
For the most accurate answer click 'Support' at the top of this page and ask Virgin Mobile's Customer Care via phone or email. You can dial *86 on your Virgin Mobile phone, too. You can also click LIVE CHAT on the left side of this web page, if available.