How u can make a mobile Phone call another mobile phone by using DC circuit?
923301
Voicemail (or voice mail, vmail or VMS, sometimes called messagebank) is a centralized system of managing telephone messages for a large group of people. In its simplest form it mimics the functions of an answering machine, uses a standard telephone handset for the user interface, and uses a centralized, computerized system rather than equipment at the individual telephone. Voicemail systems are much more sophisticated than answering machines in that they can:\n\nanswer many phones at the same time \nstore incoming voice messages in personalized mailboxes associated with the user's phone number \nenable users to forward received messages to another voice mailbox \nsend messages to one or more other user voice mailboxes \nadd a voice introduction to a forwarded message \nstore voice messages for future delivery \nmake calls to a telephone or paging service to notify the user a message has arrived in his/her mailbox \ntransfer callers to another phone number for personal assistance \nplay different message greetings to different callers. \nVoicemail messages are stored on hard disk drives, media generally used by computers to store other forms of data. Messages are recorded in digitized natural human voice similar to how music is stored on a CD. To retrieve messages, a user calls the system from any phone, logs on using Touch-tones (clearing security), and his/her messages can be retrieved immediately. Many users can retrieve or store messages at the same time on the same voicemail system.\n\nMany voicemail systems also offer an automated attendant facility. Automated attendants enable callers to a "main" business number to access directory service or self-route the call to various places such as a specific department, an extension number, or to an informational recording in a voice mailbox, etc.
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If you can use Skype as your VOIP software, there actually exists such phone which can fulfill all your requests.\n\nSee the phone link at here: http://www.amperordirect.com/pc/b-rtx/internet-phone-dualphone.html
542349
Cell phones are complex, so it depends on what part you want to know about.  Since all microphones convert sound into an electrical signal, I'll skip that.  What makes cell phones special is that you can move around (even in a vehicle across your city) and, theoretically, not lose your signal.  \n\nHow is that possible?  There is not one big tower in each city that is taking all the calls from the thousands of people.  Instead, the phone company divides each city into "cells" that each have their own base station.  The base station receives the signal from your phone and transmits it back to the central office, which is connected to the regular phone network.  The area of a cell is usually only a couple square kilometers.  When you leave a cell, the base station senses that and moves control into the new cell that you're entering.  \n\nFurther, this is efficient because these high frequency signals cannot travel very far.  Thus, whatever frequency you're using on your phone can be reused just a couple of cells away.  \n\nMoreover, each cell can only handle a few dozen or so people.  That's why sometimes you'll see "network busy" when you try to make a call.  Or if you enter a new cell that is operating at capacity, the network will drop your call.  \n\nSo that's what makes cell phones special.  The rest (converting sound to electromagnetic waves, sending the waves wirelessly) is not new to cell phones.\n\nIf you have any more specific questions, please let me know.
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There are two kinds of cellphones- GSM (Global System Mobile) and CDMA(Code Division Multiple Access). GSM SIM cards can be removed and installed in another GSM handset. \n\nCDMA phones dont have a similar SIM card, they are kind of hardwired. \n\nFind out if it is GSM, then u can do it.
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yeah u can do this with java. or more specifically with JSP. bt u have to have a SMS gateway dat u can use. mail me with ur exact requirement n i'll tell u the solution
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I use it to make calls.  How do you use it?
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There is a marvelous new invention called a "telephone".  You could use it to call your friend and ask him or her.
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Mobiles are wireless and hence the protocol used for connection between server and ur cell phone is WAP(Wireless application protocol). Besides these ur cell phone must have GPRS technology for internet access. U cant download or transfer data on ur cell phone as u do on ur home pc in megabytes.
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Here's an idea. Make one that will shock people(low voltage) when they ring your bell. ;-)
1045518
http://www.callcenterops.com/
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check this out \n\nhttp://help.yahoo.com/help/ca/mesg/phone/phone-19.html
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you just use yahoo voice messanger make a pc to phone call and ask address
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if u call ur phone service provider ppl they can tell u how 2 block numbers. at my house my dad did that and blocked this kid down the street that alwasy calls and it worked
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The best way is to setup the DataBox to the Demarcation where Bell used to be, then it will make all your existing jacks work with the VoIP.  It is pretty kewl eh?  Bell has to whip something up fast to be able to combat what VoIP is doing now.\n\nHogan
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make that telephone call
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you want to talk to your phone ?
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Here are some sites that may help.  Both have circuit examples utilizing LVDT's.  Hope this helps.