Lebara – 100GB Data, Unlimited Mins & Texts (£4.78 for 3 months, £11.95 after)

This is for the heavy users. This is a good amount of data and for the price this is a good deal.
You will need to do the port dance if you want to keep your number.
More details here:
No Yearly Price Rises:
Yes, Seriously.
No Contracts:
Stay because you choose to. 30-day rolling plans.
Roam Like Home:
Use your regular plan in the EU or India at no extra cost (up to 30 GB data). Full details here
No Credit Checks:
We believe everyone deserves connectivity regardless of their credit history. Sign up is simple and quick.
We Run on Vodafones Network:
A robust network with reliable speeds and 98% coverage. 5G is always included at no extra cost.