This thread/article is about 2 year old, but now I'm in the process of quitting Y!Mobile because – as a cheapo – I want to save more yens. My questions are at the end. First here's the info I got by grilling the salespeople.
About not having a Japanese credit card:
IIRC UQ-mobile accepts automatic charge/transfers for payments (from a Japanese bank account).
Note also that in addition to their well advertised 2-year S/M/L packages– which include discounts on monthly telephone charges (voice) + optional discount on a smartphone – they have cheaper and more generous usage-wise (also, less tricky) 1-year packages without these discounts. For someone who doesn't use the telephone a lot or already owns a compatible smartphone, the difference over a 2 year period can be drastic. Haven't used UQ-mobile yet, though.
However I have a Japanese credit card:
I'm considering getting a BIC SIM – basically they resell IIJmio with other benefits. Currently there's a campaign ending early December, which makes it cheaper than IIJmio with an additional 3GB monthly usage, times 12 (roughly one year).
I'll buy a phone separately.
My typical usage is almost no telephone (but need it just in case) and data over Wifi at work/home. But when I'm outside, I'd rather avoid a sluggish network. The UQ-mobile salespeople claimed the IIJmio and other MVNOs are slow.
For instance, I want to watch YouTube with a decent video quality. Any input on that? IIJmio Type A and Type D.
I rarely have the need, but it's even better if I can provide wifi tethering for another device which accesses the screen of a remote computer. Is this a reasonable requirement with IIJmio, nowadays?
Cheers, very useful article BTW!