I'll call first rather than text, and if they don't answer, the text I send will be one that conveys that they need to interrupt their morning to call me back, this is important and time sensitive (from a customer service perspective, you can't lock someone's rate without them in the loop, even if it's "objectively" the right thing).Trying to day-trade across days is much harder, there's no "glitch in the matrix" that yields foresight like the "glitch" created by the lag between when bond movement happens, and the couple hours it takes lenders to update rate sheets (in EXTREME cases, like March 2020, they CAN just instantly shut off locking entirely until they sort their stuff out, but in the "normal" world a business doesn't like to slam it's doors shut unannounced).