Support Phone won't make certain calls

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http://androidforums.com – Just wondering if anyone in the UK has encountered this problem and knows of a fix. I am on GiffGaff (runs on o2 network) and for some reason I cannot make calls to 08 numbers. I tried yesterday to call a 0800 number and then today tried an 0845 number. Each time I keyed the number in then pressed the green call button the number just disappeared from the dialer. Any ideas? (General)