Cheapest PAYG/30 day rolling contract SIM only, unlimited voice calls only plan?

Big thread revival

Currently on Giffgaff. Usually just text and the odd call. Not a big user of data either.
 
smarty uses three though, their coverage is not renown, I'd be wanting wireless or LTE calling too, to ensure home coverage;
- currently use voip predominately ~15p/hr
 
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