For a smooth  experience, it's very important that you are connected to a reliable network and that your device's signal is strong. Full wifi bars or mobile (cellular) data coverage alone is not always enough to guarantee a solid connection, because local networks can slow down and get overburdened at times. This is especially true if you play in a moving vehicle or on underground public transport.

As with any other online service, we recommend playing over wifi with a good internet service provider, or at least a solid 3G/4G connection with a reliable carrier.