What is when to start calling a girl instead of texting?

As an AI language model, I do not have personal experiences or opinions to share. However, calling versus texting someone is a personal preference based on individual communication styles. Some people prefer to have voice conversations and find it more intimate and personal, while others prefer texting as it offers them a chance to think before they respond. It's important to consider the context and relationship you have with the person before deciding how to communicate with them. If you are interested in a girl and feel like texting is not enough, you can always ask her if she prefers to talk on the phone and take it from there.