The vivo X300 Ultra has now had its model number officially confirmed, thanks to its certification in Indonesia by SIRIM. As you can see in the image below, the X300 Ultra has the model number V2562. It was certified alongside the also upcoming X300 FE, which has the model number V2537.The X300 Ultra is expected to be unveiled next month, and earlier today it was tipped to support a dual-lens teleconverter kit, which would be an industry-first. This would have a 400mm fixed-focus prime lens while also supporting a 200mm focal length, but you'll only be able to use one focal length at...