I've just applied for Global Entry but am having second thoughts. But I've configured Mobile Passport on my phone, and now I'm wondering what the best approach is to expediting the US entry process (as a US citizen). I'm not clear on exactly how the stages in Global Entry and Mobile Passport play out, but in thinking through what I've managed to gather, it seems to come down to whether, having arrived at the airport and had a look at the lines, I can easily choose between Global Entry and the Mobile Passport line. And whether that's convenient boils down to whether the Mobile Passport receipt I've generated can be used in the Global Entry line, or whether, in order to preserve the option to choose at the airport, I'd need to fill out both the Mobile Passport form, and the paper form.
So the key question is: Can I use a Mobile Passport receipt with Global Entry?