Then whats the advantage of iMessage if regular text message is free?
iMessage made the most sense when we had unlimited data, and texts cost. Now it's the opposite. Data is costly and texts are free
However, it's still a cheaper choice for international comms, plus of course it allows talking to users of non-cellular devices like an iPod touch or iPad.
It's also about locking users into something that gets popular, just as BBM did.
SMS is still circuit-switched; each message is essentially a very short phone call and that's why it's charged differently from other data.
This is correct.
An SMS requires carriers to do everything they have to do for a voice call: interconnect with each other, correlate charges for the service, find the recipient wherever they are around the world, authenticate them, and finally set up a switched connection to send the data.
But more than a voice call, they also have to store a text if the recipient isn't available, and then forward it when a carrier somewhere finds the target user. And send a receipt back the other way if requested.
Carriers usually allow SMS to come/go via an email gateway as well.
And SMS "hitches a ride" with the radio pinging to and from the tower. It is rather efficient because it is using waves that are being transmitted no matter what.
It only "hitches a ride" from the FINAL tower to the target phone, and ONLY AFTER there has been a phone call like setup and authentication.
The "hitch" is the absolute tiniest piece of the entire transfer from phone to phone.
MMS actually uses data, technically speaking, though it doesn't count against your data allotment.
It doesn't use your data allotment because it's NOT internet data. That's why SMS works even on dumb cell phones without data plans. No internet involved.
Carriers charging for text messages is the biggest sham ever. It literally costs them NOTHING, since they require you to have some sort of voice plan anyway. The thing is, people pay for convenience.
Incorrect. They charge for text messages not only because of all the overhead equipment needed to handle billions of them a day, but because they are actually miniature calls with all that that entails. Voice plans used to be charged at about 5 to 10 cents per minute. That's where text charges came from.
Many people heard that the message is stashed into a control packet at one point, and are misled into thinking that's true throughout its entire journey.
Nope. That's like claiming that a FedEx overnight package should be free because it only rode in the hands of the delivery person from his truck to your door. That totally ignores everything else that took place to get it that far.