I have an iPhone and have been fortunate to not have any issues with it connecting to my MB at all.
I received my MB on Wednesday. After plugging it in and letting it do its thing for a couple of hours, I witnessed my signal strength go from -114 dBm to -69 dBm B41 while I was using my phone. Pretty neat to witness. Since then, my phone has automatically locked onto the MB B41 signal whenever I pull into my driveway.
I'm on a 6S+ and haven't had to reset my phone, do a PRL update, airplane mode, or anything else. My house is in a pocket of pretty weak B41, and B25 is weak indoors, so that could be why my phone is connecting so well to the MB. Maybe I'm just lucky.
I hope this helps and that your MB starts working out for you!