Grannies Ultra Mobile isn't the name of some geriatric dance troupe. No, it's the name of a website devoted entirely to elderly ladies that you can access from portable devices. If it looks familiar it's likely because you've already been to Grannies Fucked Mobile, which is another site that has the exact same content.
Go to either site and you'll find 72 videos of grannies getting it on with men, women and multiple partners. The old babes also appear in 77 sets of pictures. None of the content is exclusive, but despite coming from multiple sources, the vids often look good and the pics tend to look good, too.
I should actually clarify that you'll find lots of women who do not qualify as GILFs. I mean, technically you could be a grandmother long before you were a senior citizen, but when you think of granny porn you imagine babes in at least their 60s I would think. You'll see some MILFs in the mix and mature women in their late 40s or early to mid-50s.
What doesn't impress me so much is that although you'll find some numbered page links at the bottom to help you browse the video and photo sections, they only really let you skip ahead or back by a few pages at most. Additionally, you can go right to the end or return to the start of the updates, but anything found in the middle takes more touches than I'd like.
It's been over two years since the website updated, so it's a good thing that loads of bonus sites are included with a membership from the All Porn Sites Pass Mobile network, like MILFs Bang Mobile and MILFs Wild Holiday Mobile. I've given a couple of theme-related examples (there are others that simply share the same content as those listed), but the bonuses cover a wide variety of niches.
As far as Grannies Ultra Mobile is concerned, though, it's worth joining for a while as long as you aren't already a member of Grannies Fucked Mobile. Just remember that if you're going to try to enjoy this collection you can't be someone who is disappointed by nonexclusive content or who would be easily frustrated by the limited pagination.