My smartphone (Hisense Infinity K0) has been giving me a lot of issues with internet speed. It can be on 3G or 4G (full signal bars as well) but the internet speed at best is around 250 bytes per second, and it struggles to reach even 1KB/s. Only WhatsApp reaches acceptable transfer rates but everything else not. Other people with the same service provider as me are not experiencing the same issues, and I've made sure my data bundle is not used up. On Wi-Fi the transfer rate is fine. I checked my installed apps and none of them are hogging bandwidth, I even disabled/restricted and uninstalled apps but the problem persists. What could be the problem and how can I go about correcting this?