Everything looks good from here. SSL Labs shows Android all the way back to 4.4.2 should be able to connect to the site:
Does it work if you turn off WiFi? Does it fail again if you turn it back on?
This kind of looks like protocol interference on the client side, possibly by your ISP or something on your phone for some reason. I’d be happy to diagnose it further but we’d need additional information and a bit of back and forth.