UK PAYG 有効期限

イギリスのプリペイド SIM ですが、180日に一回使用すれば、Credit は失効しないらしい。Vodafone の場合、180日の Deadline を過ぎたら、90日以内にTop Upして使用すれば良いらしい。ドイツは、全然使わなくても残高がある限り有効ですが....　
$100入れないと1年間有効にならないアメリカや、60日しか有効期限がない日本やフランスよりずっとまし。

[Vodafone UK]
All PAYG SIMs will go into a state called Quarantined if not used for 180 days. In this case the definition of used means a chargeable event such as accessing a web page. If the SIM does go into the Quarantined state then you would then have another 90 days in which to topup and use the SIM for a chargeable event. Please note that during these 90 days any remaining credit that you have on the SIM will remain, however after these final 90 days have passed then the credit will be removed and then the SIM card disconnected from the network the next day.
http://bit.ly/aeB6rm

[O2 UK]
You need to make a chargeable call every 180 days and top-up at least every 999 days.
http://bit.ly/9kR8LU