There is an existing (since Android 4.0) set of CTS tests for the VoicemailProvider APIs that allow an app to insert/query/delete voicemails into the platform. These are the same APIs that VVM uses to add/delete voicemails so that any Dialer app can display them in the UI.
*You must purchase a Premium Group slydial subscription to prerecord a message. GROUP SLYDIAL $0.10 PER SLYDIAL SEND A MESSAGE TO UP TO 10 CONTACTS AT A TIME NO ADVERTISMENTS CLICK2SLYDIAL REFERRAL BONUS PROGRAM GET IT $0.10 PER SLYDIAL PREMIUM GROUP SLYDIAL Enjoy sending one prerecorded voicemail to up to 10 phone numbers at once through the slydial app or send one live voicemail to one phone number. 10¢ deducted for each successfully delivered voicemail. Credits prepurchased in $5.00 increments. SEND A MESSAGE TO UP TO 10 CONTACTS AT A TIME THROUGH THE APP NO ADVERTISMENTS CLICK2SLYDIAL REFERRAL BONUS PROGRAM NEED TO CONTACT MORE THAN 10 NUMBERS? TRY SLYBROADCAST! SIGN UP NOW $2.99/MONTH OR $29.99/YEAR PREMIUM MONTHLY/ANNUAL PLAN Send unlimited live voicemails to one phone number at a time, NO ADVERTISMENTS CLICK2SLYDIAL REFERRAL BONUS PROGRAM SIGN UP NOW Compare Our Services Expand Frequently Asked Questions Collapse Frequently Asked Questions Slydial is a free voice messaging service that connects you directly to someone's mobile voicemail. Slydial is a service of MobileSphere. While the word 'sly' can draw up connotations of being wily, crafty or mischievous (e.g. 'sly like a fox'), it can also mean clever, resourceful and efficient. We created slydial for people who appreciate clever, resourceful and efficient methods of communication, whether they exist in everyday tasks, business interactions, matters of the heart or ... clandestine operations. Anyone who is short on time, wants to avoid an awkward conversation, or doesn't want to bother someone, but needs to leave them a voicemail. No matter where you are in the walk of life, be it a college coed, a working stiff, a soccer mom, or an empty nester, we guarantee you that there will be situations in your life everyday where slydial will be helpful to you. Yes. Slydial has an app for the iPhone and the Android. The slydial app allows you to quickly connect to the number or contact of your choice without dialing the access number directly. The app also allows you to view your slydial history, account balance and contact the slydial Customer Care team. slydial works from any U.S. mobile phone number, excluding VoIP numbers. Well to the best of our knowledge, there is no other service that does quite what slydial does. While some mobile phone carriers enable their users to reply to or send voicemails within their voicemail system, there are significant limitations. For example, voicemails can only be sent to users with the same carrier (e.g. Verizon) and more specifically only to users within a certain geographic area (e.g. New York metro). slydial connects you directly to the voicemail of any U.S. mobile user, regardless of their carrier or geographic location. In most cases the person you're slydialing simply receives a new voicemail alert a minute or so after you leave them a message. With some mobile phones, the recipient's phone may emit an abbreviated "half ring" before going directly to voicemail. On occasion, with some mobile carriers, you may hear a ringing sound/tone while you are waiting to be connected to the recipient's voicemail. This is not the recipient's phone ringing; this is the recipient's mobile carrier playing a ring tone while they attempt to locate the recipient. No. We do not require you to sign up for the service in order to use it. Just dial 267-SLY-DIAL (267-759-3425) and you are ready to go. However, to enjoy advanced features including slydial apps for iPhone and Android smartphones, as well as rapid connection to voicemail with NO advertising, join slydial Premium. Learn more. Yes, we do not charge you anything to use the service. However, domestic long distance, cellular airtime minutes or additional data charges may apply. (So if you would normally get charged for calling a phone number with a "267" area code then you will get charged making a slydial call.)