Hi Podd, thank you for coming back to us! No problem, we are here to help!
Is the handset unlocked for all networks?
Were you prompted to input a pin when you first inserted the SIM to unlock it?
If you can please try turning off the handset, removing the second SIM, placing our SIM in slot 1 and then rebooting the handset. If the SIM then prompts you for a PIN please use the one provided on this page in the 'SIM unlock pin' section.
Let us know how you get on!
All the best.
Molly