Yes, you can have one main number which routes through to multiple SIMs.
We would provide you with a hunt group, when a call comes into your main number, all SIMs in that group would receive the call and it can be answered by anyone in that group.
All the SIMs can also be set up with the same outbound caller ID so that when people ring you back it will go through to the main line and ring everyone.
With this set up you will also have direct dials so if you need someone to be able to just ring your SIM and not go via the hunt group you can just give them your direct dial number.
Each SIM will need its own plan as the plan allowance can not be shared. So for example if you need 3 SIMs with this set up, they would each need a base plan so £10 + VAT x 3 per month.
If you have any questions about this set up, please do not hesitate to contact our support team (support@onsim.uk)