Huawei Ascend Y221 Y221 Quick Start Guide - Page 2

Dual-Card Dual-Standby Your mobile phone supports dual-card dual-standby mode, which can significantly reduce power consumption and increase your phone's standby time. Note that two restrictions exist:  When you make calls using one SIM card, the other SIM card is disabled. For example, when you make calls using SIM card 1, SIM card 2 cannot be used to answer calls or access the Internet. If someone calls SIM card 2, the caller will hear a voice message like "The subscriber you dialed is out of the service zone" or "The subscriber you dialed is not able to answer your call, please try again later." This is because your mobile phone cannot access the network with both SIM cards at the same time and has nothing to do with your service provider's network condition. It is recommended that you subscribe to services such as voicemail or missed-call reminders from your service provider to avoid the inconvenience caused by missed calls.  When you are using one SIM card's data services, you can receive calls and messages using the other SIM card, but data services will be interrupted. For example, when SIM card 1's data services are in use, you can use SIM card 2 for calling and messaging, but SIM card 1's data services will be interrupted as a result. When the call using SIM card 2 is terminated, or the message is received or sent, you can resume using SIM card 1's data services. 1