You can download Symbian V5 directly. Bella also belongs to Symbian system, but the system remains unchanged, but the function is upgraded. In fact, the mobile phone is still a Symbian V5 system. In fact, it is not very cost-effective to buy a Nokia mobile phone now, because a lot of software downloaded by a mobile phone needs to be signed, but now Symbian can't produce a signed certificate, so it may only download some commonly used software, such as mainstream software that basically needs to be signed or has no Symbian system version. If you want to play computer games, Nokia is not for you. You can choose Android. Saipan has long stopped developing software and has few resources. Some can only be converted from Android, so think again.