Mobile Phone top-ups

Just noticed last week my mobile was out of credit, after hardly any usage.  I recently got the phone as a present yes the fabled “Santa” at my age !!! (only joking) Didn’t use it much just to be contactable but it now seems I will have to top the mobile up monthly regardless of usage. Was using the landline but will have to reverse to the mobile now. Anyone else have the same situation ?

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