It won't be switched off during the life time of you contract, Internet on modern phones in the Uk has used the following,
WAP (dial up)
GPRS (2G)
EDGE (2.5G)
3G
4G
All of them still function and are still network supported.
Some areas only support GPRS still anyway and many smart phone users are still primarily using this transfer rate.
I wouldn't pay extra for 4G until the networks have all rolled it out across the majority of there networks, as it stands the early adopters are paying for the infrastructure so let the mugs pay the extra money and wait a couple of years.
As a side O2 never finished there 3G roll out......
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