Can I ring European numbers whilst roaming in Europe as part of my monthly allowance

Depends where you are @m155698.

All iD plans include inclusive EU roaming, which lets you roam like at home in 50 countries across the EU, and some beyond. The minutes, texts and data simply come out of your monthly allowances - subject to iD’s fair usage & open data policies. 

Roam like at home in the following places:

Band 1 - Austria, Azores, Belgium, Bulgaria, Canary Islands, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, French Guiana, Germany, Gibraltar, Greece, Guadeloupe, Guernsey, Hungary, Iceland, Ireland, Isle of Man, Italy, Jersey, Latvia, Liechtenstein, Lithuania, Luxembourg, Madeira, Malta, Martinique, Monaco, Netherlands, Norway, Poland, Portugal, Réunion, Romania, Saint Barthélemy, Saint-Martin, San Marino, Slovakia, Slovenia, Spain, Sweden, Vatican City.

Band 2 - Azerbaijan, Macedonia, Belarus, Kazakhstan.