Best Answer: They have an expiration date because they have chemicals in them they will lose their potency if they are not used it time, and they will dry out and become useless. It doesnt matter if they stay in the packet, not opened, ,they will still expire, same as food...lol. Source(s): amanda Â· 7 years ago.
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An international call prefix or dial out code is a trunk prefix used to select an international telephone circuit for placing an international call. It is often referred to as IDD Prefix (International Direct Dialing)âa country will typically have a NDD Prefix as well (National Direct Dialing). The international dialing prefix must be dialed before the country calling code and the destination telephone number. It is synonymous with international access code or exit code. The international call prefix is part of the telephone numbering plan of a country for calls to another country. The International Telecommunication Union (ITU) recommends the sequence 00 as a standard for an international call prefix, and this has been implemented by many countries, but not all of them.