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International directory enquiries norfloxacino con fenazopiridina Operators can change the SIMs, and update the encryption, but users are surprisingly reluctant to slot a new SIM into their handsets - they become quite emotional about it, proud to be using decades-old chippery, which stalls upgrade programmes. It's also expensive - adding a dollar to the cost of the SIM may seem like a small deal, but when a network has 10 million customers it becomes a significant expense.