Only compatible for 4g devises. Im using this service but not happy with this network. Becous the network is not stable, very poor signal , call drops always , when using data mobile is heating & only network available in city’s out side no network, downloading speed is very slow only network showing 4g, but speed like 2g.using 3, 4g mobiles with same prob with me, when using jiojoin app for calling its showing always online in notification bar & battery draining issue.