Re: Correction
To state the obvious, to benefit from no roaming charges you have to be outside your own location.
UK to UK is within your minutes.
France to France, Germany, or UK is within your minutes.
UK to France will cost you bigtime.
My son has Vodafone Red, pay monthly. They charge £1.50 per minute from UK to Ireland but Ireland to UK doesn't cost as it's roaming and within his minutes.
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From Vodafone's website
Calls to Europe from the UK £1.50 a minute (inc. VAT)
Calls to our Rest of World zone from the UK £2.00 a minute (inc. VAT)
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giffgaff charge 2p landline and 5p per minute to phone Ireland.