GPRS or General Packet Radio Service is a method, in the course of which 2G phones are developed to facilitate them to send and receive data at a great speed. With this GPRS connection, the phone is always on and can transfer data typically at a speed of 32-48 kbps without any delay. Moreover, the added advantage is that the data can be transferred at the same time while making a voice call. GPRS is part of a series of technologies that are intended to move 2G networks nearer to the performance of 3G networks. This speed at which data is transferred is determined by the class of a GPRS phone. Technically the class refers to the number of timeslots available for upload (sending data from the phone) or downloads (receiving data from the network). The timeslots used for data are in addition to the slot that is reserved for voice calls. These timeslots are available concurrently, therefore the greater the number of slots, the faster the data transfer speed. GPRS transmits data in packet and therefore the timeslots are shared amongst all users of the network instead of making use of them all the time which in turn increases the overall data capacity of the network. The bill for using this technology depends on the quantity of data transmitted and not on the time of being online.
HSPA (High Speed Packet Access) is like having the home cable broadband experience delivered to the mobile phone or notebook. HSPA is part of the GSM 3G network and is (predominately) a software upgrade of the network infrastructure. To use the high speed variant, it is necessary to have a mobile device that is HSPA-enabled – most new mobile phones and high-end notebooks only have these as standard. Belonging to the family of GSM, It is the latest technology to enable even faster data rates for mobile users. It has various enhancements on its route. Firstly, HSDPA ( High Speed Downlink Packet Access) has the capability to take delivery of bulky files to the mobile device such as email attachments, PowerPoint presentations or web pages. HSDPA 3.6mbps network can download a typical music file of around 3Mbytes in 8.3 seconds and a 5Mbps video clip in 13.9 seconds. Speeds achieved by HSDPA top 14.4Mb/s but most network operators provide speeds up to 3.6Mbps, with the rollout of 7.2Mbps quickly growing. HSUPA (High Speed Uplink Packet Access) is a further enhancement that helps in increasing the speed by which one can communicate from the mobile device, for example one can easily upload videos from UTube within a few seconds. Here the upload speed is increased to a maximum of 5.7Mb/s. HSPA Evolved which is also known as HSPA+ delivers data services, permit speed of up to 42Mb/s in the downlink and 11Mb/s in the uplink.