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There are out of plan add-ons for International & UK calls, texts & data for £5, £10 or £15, see hereDashboard | SMARTY

Are you referring to'You can always pause your plan by turning off auto-renewing payments'I would expect it to pause at the end of your current plan

Try this test (assuming wi-fi calling is ON in your settings)Turn Flight mode ON (this may turn wi-fi off)Turn wi-fi back ON if it went offWait 30 secondsIf you can make a call then wi-fi calling worksTurn Flight mode back OFF

Have you checked hereNetwork status checker | SMARTY

Can you call other UK numbers ?