Doro 8030 with Giffgaff SIM refuses to connect

We have a Doro 8030. When booted up there is a large circle in the upper left hand corner of the screen. It goes round and round. There is also a small 'x' above the icon showing signal bars. Many of the virtual buttons wont work. The OS seems to have frozen. It is then impossible to make calls or SMS texts. Often the time displayed is wrong. Is this Google Player Services screwing things up, or is there a bug in the OS? The SIM is a Giffgaff SIM (actually O2). At this stage Rebooting is ignored. Thank you. CJB

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