Have you A/B tested the "phone/email in any field" feature and found it results in easier data entry than telling people where to enter that information? I ask

Have you A/B tested the "phone/email in any field" feature and found it results in easier data entry than telling people where to enter that information? I ask as it goes against the principle where giving people less choice can sometimes result in increased conversions. Here, you are asking users to make a choice (albeit, a tiny one) where to enter the information rather than having it consistent every time. Was there clear data which prompted you to implement this format? If so, I'd love to see the testing methodology.