I got a new Lumia 540 unlocked phone. I've inserted my koodo SIM card into it but the phone can't detect the Koodo network. It shows no network found. So I can't even make calls. I tried using another provider's SIM card and it worked. Any ideas please?
Ivan already touched on this, but the other provider's SIM the OP tried was Rogers/Fido/Chatr. They're the only ones with 2G in Canada. That's why the 540 recognized those. Everyone else is 3G 850/1900 only (LTE is yet another set of bands).
Sorry Pet Tessy, you'll have to buy a different phone.