The question of "true PAYG" vs "Blocks of data that expire" is a tricky one to decide. It really depends what your regular usage is, and what your emergency usage would be.
I'm a relatively infrequent mobile user, who uses SIM-only PAYG.
One thing though - I see they don't allow tethering on this service.
For our mobiles, we use EE PAYG, and have pretty low demands right now.
I started using their £1 per week data pack with 100MB allowance (so roughly 500MB per month), but using their bonus packs, I get to boost this by an extra 50MB after each 3 months.
The pricing ends up at around 1p per MB (similar to 3's 3-2-1), if I use all of the 100MB, though the pack also comes with a few minutes and texts too. Once each boost gets added, the cost obviously reduces (again, if you use all of the data).
I'm finding 100-150MB per week is enough for me for regular use. Teenage daughter needs more - but 200MB per week seems to cover it. The wife finds 50MB closer, but wanted more texts, so uses a slightly different weekly pack (only 10MB allowance), with a 50MB data boost.
With the boosts from 3-6 months, these EE SIMs are now acting cheaper than our previous Three ones were, and the coverage is better.
Tethering is allowed, but I only use this for browsing from a tablet, and again, infrequently during the week.
I hardly ever use tethering, but have found it extremely useful on a couple of occasions when my landline broadband has gone done temporarily, and I've needed an emergency backup service.
( My studio is in my house, so I need a broadband connection here for my work. )
Ah, for emergency backup when the landline fails, I use a separate solution; more of that later.
On the above PAYG packs, I could choose to add blocks of data for emergency use for work:
- 100MB for £1 (lasts 7 days)
- 500MB for £3 (lasts 7 days)
- 500MB for £5 (lasts 30 days)
- 1GB for £7.50 (lasts 30 days)
- 3GB for £15 (lasts 30 days)
As it would be work usage, it would be almost a no-brainer to use these blocks, depending on the length of outage.
But for more efficient emergency usage -as it would include my wife's work and the kids' connections too - I have a "MiFi"-style device (Huawei e5372), an external antenna (MIMO) and then make use of specific EE MBB (mobile broadband) SIMs. They are still a form of PAYG, but data-oriented.
The cheapest way to use the MiFi device has been to buy one of the pre-loaded SIMs from Amazon; with 6GB, they tend to be priced around £15 (0.25p per MB). They're valid for 90 days once you start to use them, but we tend to have one pre-purchased, unused, ready for such an emergency. And they tend to be cheaper than the 24GB/annual pre-loaded SIMs.
Once used up, the SIM can be discarded, and replaced with a new pre-loaded one, or topped-up and used with add-ons similar to the ones above. On an MBB SIM, the add-ons tend to be a little more expensive, but you can get larger ones.
- 500MB for £3 (lasts 1 day)
- 1GB for £10 (lasts 30 days)
- 2GB for £15 (lasts 30 days)
- 4GB for £20 (lasts 30 days)
- 10GB for £30 (lasts 30 days)
Compared to these, a new SIM, pre-loaded with 6GB, lasting 90 days is quite a good deal.
This setup also tends to then be used by the family for holidays. We do go through the blocks of data then.