Lyca Mobile 20GB Data -£3.50pm / 30GB -£4.50pm / 100GB - £6pm -EU roaming - first 3 months price - no contract, Student offer @ Lycamobile

So if I don't go to Greece, Germany and Poland or use WiFi calling for the next three months I'll be fine? (edited)

cheaper than paying for a roaming pass

Lebara use a different network so there's no surprise that you may find different performance at a particular location.

No.
Those are mifi devices, you need a specific SIM for those, strictly loaded with data.
These sims and their data do not register on mifi devices.

Alternative is that you create a hotspot out of your phone, that will allow approved devices to tether the data from your plan.

Also be aware there is a fair usage limit on these sims, so the data you're buying is not what you can use abroad. (edited)

O2

No, it's no contract so can cancel anytime

4GB

So Lebara has 20GB for £1.99 already HERE , cheaper than Lyca's £3.50 (edited)

i can send out the message, but i get a message “Sorry, your PAC request has failed for the mobile number: 44xxxxxxxxxx. Please try again later or contact customer service!”

anyone know how to get a pac?

i have try to use live chat in the ios app, but it will disconnect every time i confirm i need a pac code

Yep, something fishy going on. I had my number over 20 years and probably had 2 or 3 spam calls in that time. Move to Lyca couple of months ago and had 5 already!

Two different networks, Lebara use Vodafone and Lyca use o2 - I'm sure that others will have opposite issue depending on where they are.

You have to order this deal with a physical sim, then when it's delivered and started order a free esim then do the sim swap in "my account" after you have registered. I prefer to use their website rather than the app.