interesting discussion, im looking into the exact same problem, i am on vodafone in uk, moving to barcelona, i already have a “dongle” in uk through vodafone and use it all the time when im away from the office and on the road, so would rather have a “dongle” in spain too if its easier, i only use internet for email and basic internet use.
but my main problem with the phone has always been which tariff or company to use, i will be spending at least 7/10 days of the month in the uk, but, when im in spain, with my business, i will still be having daily contact with the UK, all my clients are in the UK, so need a good tariff for calls from spain to uk, from a mobile, i cant really have a landline number
so interested in what you said about a SIM
andrew