APP OR UNLIMITED TEXTING & CALLING SERVICE WHICH PROVIDES USA PHONE NUMBER

I am in search of an application or service that allows me to have boundless capabilities to send and receive SMS, MMS, and calls. While having the ability to make calls is not a strict requirement, it would be a bonus. However, it is crucial that the texting feature remains unlimited, with the added convenience of being able to text any USA number from a USA number without any restrictions or time limits. I need an app or service that grants me the freedom to use it at any given time, without any limitations or time constraints.