The cost of data usage on GPRS depends on a variety of factors, such as the provider and plan you choose, the network coverage and quality, the type and size of data, and the device and settings. Different providers may have different rates, plans, and packages for GPRS data, so it's important to compare the options and select the one that fits your needs and budget. Additionally, GPRS data speed and reliability may be affected by the network signal and congestion. The amount of data packets sent or received also varies depending on the type of data. For instance, streaming a video requires more packets than browsing a web page. Lastly, the device you use to access GPRS data may influence your data cost due to its features, functions, and settings. For example, some devices may automatically update apps or sync data in the background, leading to increased usage.