Failed to connect to Internet – One can’t connect to Internet at one go or the device doesn’t get connected to Internet
Require Multiple connection attempts – Multiple connection attempts are required to connect to Internet
Connection established : But no up-link and down-link – Though a packet data connection is established there won’t be any data transmission happening really
Access point issues – Not all devices have this issue, but to address a few devices which are old and have this specific problem of identifying the APN automatically have this issue, as auto search pops up random number in connection name as seen below. ( Not a serious issue to consider, but worth a point to be noted when compared with other operators)