Really appreciate the replies and for moving my post to this thread. Now... 1: my Sim was already a Nano sim. My previous phone was LTE phone with only Nano Sim card slot. So not an issue with Sim size. 2.My old Sim of course had a little play in the slot, the same is with the new Sim too. 3 . I have tried reseting the network settings but with no success. My Robin still says insert Sim.. 😢 So what next... Please help!