Unfortunately, that seriously limits the armbands that will work, b/c most of them have the four top and bottom straps that hold the phone.

Glad I did!I was originally concerned the velcro wouldn't hold (it looks like it barely grabs the strap) however, I just finished a 45 minute Spartan/Freeletics (body weight lots of jumping and whole body movements) workout and I am happy to say my phone didn't move, at all.

The strap, however, is a major fail.