Plivo lets prospective customers sign up for a free trial. Trial accounts come with credits to use Plivo's voice and SMS APIs and other capabilities.
A free trial account lets you try out domestic and international voice calls and SMS text messaging.
Plivo free trial accounts never expire, but there are some important differences between free trial and Standard accounts that make signing up for Standard worth your while. You can upgrade your free trial to a Standard account to use Plivo’s full suite with no restrictions by visiting Billing > Upgrade.