If so, unfortunately, most prepaid plans don't have the conditional call forwarding feature (allows a phone to ring before going to voicemail).
Prepaid plans include, but are not limited to, T-Mobile Flex Pay, Boost, Virgin, MetroPCS, Cricket, and Simple Mobile.
Why won't prepaid plans work?
Prepaid carriers don't have the conditional call forwarding feature, which allows a phone to ring before being sent to voicemail. We recommend contacting your carriers and request that YouMail be a voicemail option, or at the very least, allow conditional call forwarding to another phone number.