Works, not on every device

Please make an update to make an iPhone 4 or older model connect to something like an iPhone 4s. I (with a 4s) can connect to my friends phone (4) but he cant connect his phone to mine. Its not even being recognized. Please fix this issue.

Cr!$t!4n about TuneMob Play Music in Sync on Multiple Devices via Bluetooth and WiFi Tune Mob Simple Sharing