In our expert opinion, we believe that OptinMonster is the best SMS marketing plugin for WordPress because it can be integrated with multiple SMS providers, has 50+ customizable templates, and is easy to use.
However, if you have a WooCommerce or Easy Digital Downloads store, then we recommend using the Drip plugin, as it has specific features for online stores.
If you want to use an all-in-one communication platform that allows you to manage phone calls, voice messages, text messages, and video conferencing, then Nextiva is an excellent option.
Similarly, if you are looking for a free solution, then Ultimate WP SMS and HubSpot are great choices.