SIF helps users not only send faxes and emails but also send text messages (up to 160 symbols) on any mobile phone and voice messages on regular/mobile phones in North America (using services of external providers). You don't need a voice recorder, type the message, it will be converted into voice message and delivered to a destination phone. This service (text-to-phone) is useful in the following situations:-make calls on phones from the places, where usage of mobile phones is not recommended/allowed (class rooms, courts, hospitals, libraries,….)-allow people with speaking problems send voice messages from PC or mobile PDA without a need to buy/use a separate device, such as "TextPhone" of BT,-if your spoken English is not perfect.SIF helps users to save money on sending faxes outside your local area. You also may use SIF for remote printing of your memos/ideas when you are on the road. SIF3 allows you to create contact lists with thousands of e-mails, fax, phone numbers and to send personalized messages to people on your contact lists.

Known problems:
On some networks it is not working.