Quote:
“are there any advantages to ordering more than one?”
I see the idea of ordering two, you could activate and use one immediately and then delay ordering the second one until the end of May, then wait as close to the 14 day activation period as you dare before adding the credit and activating. This will give you a few weeks - month extra data to use once the first (earlier) sim has expired it's second and final month. This is what I intend to do myself.
Of course you will need to top up both sims with £10, but how much data will £10 get you on any other network?, even for the few weeks of additional use, the second sim is worth it.
You may also use more than 100GB in a month - exhausting the allowance before the 30 day period is up, in which case you can switch to additional sim(s) to cover the run on usage. I don't use anywhere close to 100GB a month, even having no access to ADSL, but I can see the attraction for those who do.