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    Holywell / Treffynnon is in Clwyd, Wales, Wales.

    The 5G results above are for the postcode CH8 7LJ in Holywell / Treffynnon, 5G mobile coverage can vary by postcode so for more exact results compare our 5G map mobile coverage checker to search for your exact postcode.

    About these results.

    These results show the mobile signal for each network in your postcode area.