Keep in mind that the all-you-can-eat style packages only include calls/sms to UK numbers, even in feel-at-home countries, so if you want to call or text any number that's not a UK number you'll need extra credit in your account beyond what the package costs. Same goes for data/calls/sms in non-feel-at-home countries.
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It'is difficult to top up without being in the UK or having a UK card, and even a UK card must be registered to a UK address.
Some of us need something before then, though.
I've been poking around the DUS web site, looking for shops that might be able to sell me a Vodafone "CallYa Smartphone Special" SIM card when I land there in a couple of months. There's a "mobilcom debitel" shop on Level 2 that looks promising; they have the starter packs on their web site, and theirs come with €15 credit instead of the standard €10.
Can't seem to find any MUNDO sim cards on ebay now! I definitely remember seeing them previously.
I shall be travelling in France for 2 separate periods of approx. 5 weeks (all of June, and then again Sept.-Oct.). I shall be taking an unlocked Huawei Y635 phone and planning to buy a local SIM when I arrive in France. Ideally I'd like a plan that will cover the whole period June-October so that I don't have to go through this a second time later in the year.
Looking at the WillMyPhoneWork website I haven't been able to identify a preferred carrier for this phone in France. There seem to be several which will work only on 2G, whereas I think this phone is capable of 4G. I'm ignorant about such things as I don't use a mobile any other time except when on holiday.
But last year it proved virtually essential during the French train strikes. Then I had a 3 Feel at Home SIM bought in the UK but had many problems making phone calls in France and was unable to top it up because it was linked to my UK debit card registered to my Australian address, and not to a UK address. So this time I'd definitely prefer to buy a specifically French SIM in France.
Does anyone have a specific recommendation of a French provider for my needs?
Rather than risk missing my train from CDG after horrendous immigration delays, I waited until I had an hour between trains at Lyon and went to the Orange shop in the mall just opposite the station there. I paid 29.99€ for a Mobicarte+ SIM and a month's usage (not sure what it covered as I used wi-fi exclusively for internet access). Local phone calls were fine although I did find myself in one hilly rural village where 'everyone' knew there was no Orange coverage unless you went near the river at the bottom of the hill! The tourist office kindly made the reservations I wanted for me there without charge.
For my September trip (or anytime until31/1/2019) I can now buy a recharge voucher from a tabac or elsewhere for another 20€ to cover another month. I hope to do this at an Orange shop so that I can explain that I really need it only for phone calls, hoping I can get away with paying less.
This may well not be the cheapest option but the Orange staff member was very helpful in getting it set up and spoke adequate English.