Fond the following criteria your phone must have. This site doesn't list Stylo as one of the popular options, but I read on another site that people were able to use it (depending on carrier). Here are the criteria your phone needs to have:
"(1) Phone must be a GSM or CDMA phone with one of the major carriers.
◾If your phone was under a regular contract with AT&T, Cingular, T-Mobile, Verizon, or Sprint it should work.
◾If your phone was originally purchased for a prepaid plan on carrier that is not AT&T, Cingular, T-Mobile, Verizon or Sprint – there is a chance it may work, if the phone is unlocked. However, it may not work. Consider purchasing a low-cost phone from Straight Talk if you are in this situation.