PlentyofFish is not a free service, and users must pay for a subscription or membership in order to access all of the features, including the ability to message other users. However, some basic features such as creating a profile and browsing potential sections are available for free. If you want to use other services and initiate conversations, you will need to purchase a paid subscription.
It's also worth noting that plentyoffish does not provide a 24x7 phone service but you can contact them via email or live chat and they will assist you with your queries.