UK operator T-Mobile is disconnecting its CSD-WAP subscribers from July 9th, suggesting customers might like to switch to GPRS or something a little more 21st century, and disposing of pay-per-minute internet access. Circuit Switched Data (CSD) was how mobile phones accessed data services in the early days, or at least the technology that allowed them to try. Technically equivalent to a dial-up modem, it allows speeds of up to 9.6Kb/s, ideal for downloading the latest news and reviews from the Mobile Internet.
The first WAP phones only had CSD, and it was the 9.6Kb/sec speed that drove the creation of WAP itself: a desperate attempt to create a usable experience over such slow connections. But even the mono graphics and text-menu content was painfully slow to use, and starkly contrasted with TV advertising in the UK, from Genie Internet, promoting the Mobile Internet.
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