Does WiFi Calling and VoLTE work outside of the UK?
WiFi Calling is not supported when abroad, so you’ll need to be in the UK and have an active plan or credit to make use of it. 在英国境外，WiFi通话和VoLTE功能是否可用？
在国外不支持 WiFi 通话，因此您需要在英国境内并拥有有效的套餐或话费余额才能使用该功能。
Does WiFi calling work with any giffgaff SIM?
You’ll be able to use any giffgaff SIM that supports 4G. WiFi通话功能是否适用于所有giffgaff SIM卡？
您可以使用任何支持 4G 的 giffgaff SIM 卡。
You can check if you have migrated by dialling the number to check balance *100# and hitting call/send, if this comes back with an error like ‘Invalid MMI code’ then your account has been migrated for WiFi calling VoLTE features.
您可以拨打查询余额号码 * 100# 并按呼叫/发送来检查您是否已迁移，如果返回 “无效的 MMI 代码” 之类的错误，则表示您的帐户已迁移到 WiFi 通话 VoLTE 功能。
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