+ Your phone contract allows inbound international calls and they are NOT blocked. Some pre-pay SIMs block them.
+ Your phone does not have a DND or "Do Not Disturb" setting enabled for unknown callers.
+ If a prepay SIM card, check there is balance. Some providers require a balance to receive non-domestic inbound calls.
If you want to divert all inbound calls to your 2ndNumber, you need to enable the 'Call Diversion' option.
Log into your 2ndNumber dashboard and click the 'Profile' icon. Now look for 'Call Diversion':
Tick the tickbox and you'll be presented with a window where you will type in a phone number to divert all calls to. This can be any number on any network.
Once the divert is set, all inbound calls to your 2ndNumber will ring on your diverted line and NOT on your 2ndNumber web phone. If you wish to remove the divert at a later point, go back to the 'Profile' page and untick the 'Call Diversion' checkbox.