nokia 3110 vintage retro collectible mobile phone originally came from BT cellnet which is O2 network O2 Sim card absolutely working fine on it. I put O2 Sim and I make a phone calls. Everything works as it should course this is very old mobile phone and I’m happy that the battery is still lasting, but I cannot tell you how long they hold charge unfortunately no charger good for collectors still in good condition all around and works please check the pictures for condition so you understand what are you getting? You will get exactly what you see in the pictures. Thanks. top part of Ariel is damaged but it’s unscrews and it’s replaceable. Also keep in mind. I don’t know how long the battery will last it’s charge zone works but don’t know how long it go because this is very old phone perfect for collectors hard to get these days working condition