I've never had any luck with any BT speaker picking up the signal from a phone with the phone in my jersey pocket. It's nothing to do with the speaker and everything to do with the fact that BT is terrible stop-gap technology. I have my phone in a tinkered-with Maxpedition case mounted under my handlebar. Also conserves battery, because with the phone maybe 6" from the speaker, the transmission power is really low. A 4-hour ride typically consumes about 15% of my phone's battery.