Carphone Warehouse - Sony Ericsson phone - Orange network - need help with phone please : )?

bought a Sony Ericsson mobile with £10 voucher from carphone warehouse - went online and current balance of £10 is registered, but can't use it to make calls - phoned a help line and the man i spoke to was no help, couldn't understand him (In India?) can't use phone - any help appcreciated - thanks
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