My father has Simyo pre-paid card. He uses it when he comes to visit us in the Netherlands. He is now in Serbia and he cannot use it. It says: 'Not registered on the network'. I tried to solve it and searched on the internet, but did not help.
When he is Serbia he does not use it very often, but we use Viber & I sometimes call him. This is now also not possible.
Could you please assist us?
Thank you in advance.
With kind regards,
Olja & Paja
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