Some telephones, depending on the brand and model, have the intercom function, which allows to begin communication by sending the signal. When the signal comes, the telephone set rings a signal different from the standard ring tone call. After that the telephone temporarily switches off from the telephone line and works as an intercom.
The YACKIE Mobile SIM card ensures the lowest pricing for the business traveler anywhere in the world, while maximizing convenience. Pay no more additional roaming charges to your mobile operator. The same low pricing applies to accessing your voice mail
Read more