The amount that can be sent is confined by the End Users connection, their connection speed and the speed of the infrastructure that the data is traversing. Theoretically unlimited.
HUB
Infranet refers to the proposed system transferring sensitive data masquerading as anodyne data over the internet. It also is protective architecture for the internet and packet based telecommunication networks.
3G refers to the generation of cellular network technology. I refers mostly to the data transmission over such a network especially for internet access.
VoIP (Voice over IP) refers to a way to carry telephone calls over an IP data network. It offers a set of faculties to manage the delivery of voice information over Internet in digital form.
Data transmitted over the Internet is broken into Packets when transmitted over the Internet or other network.
A data call is a call that is made over a data network such as when you use Wi-Fi or 3G. Voice Over Internet Protocol are data calls. They are calls that use an Internet connection.
VoIP Voice Over internet Protocol or simply communication over internet networks. It means transmitting voice data using internet.
The telephone call has been transmitted over data networks/internet.
E-commerce refers to the purchase and sale of goods and services over the internet, as well as the movement of funds and data to complete the transaction. Electronic commerce, or internet commerce, is another name for it.
The answer would be a Protocol. A protocol is the set of rules for transferring data over the Internet.
packets
Using the app sends data to others through WiFi or 3G, so if you have a limited Internet data plan, then yes, it uses data. Since it only sends simple graphics, the data amount sent and received is quite low, so it is unlikely to put you over your limit.