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Well, I signed up, paid my £10, and used it in anger for a few weeks. I even ported my number to it. Sadly, I can't recommend it.

I spend most of my day in a rural location that borders several 2G cells and has no 3G coverage. My phone seemed to spend much of the time switching between cells to get the best signal. All too often, the handover would fail and I would be left with no signal, even though there was plenty of strength and signal quality to be had. 

It's either a problem with the network of Vodafone (the MVNO's host) or with +Ovivo Mobile's authorization server. The latter seems most likely.

3G coverage elsewhere was fine. But if I can't reliably receive calls and texts where I work, despite good 2G coverage, it's a bit of a non-starter.

I've just ported again, to +Three UK. So far so good...
Tom Kelsall's profile photoDaniel Bull's profile photoRichi Jennings's profile photo

Richi... I have learned that the only tag-on provider worthy of use in UK is giffgaff... And the only 3G network worthy of real praise is 3UK. O2 come a middle distance second... But Voidafone are utterly dreadful when you step outside the city walls.
The data speed wasn't the issue: I have good Wi-Fi here. But if my phone network can't get a phone call to me, that's a bit of a problem ;-)
Ugh. These days, when I travel to the U.S., I use a 7-day prepaid SIM from ReadySIM, which virtualizes T-Mo. Works great in my Nexus 4. $25 for 500MB and unlimited calls+SMS.
I've been on Vodafone for years. Their service has been great as is my contract but just recently I've started to lose my patience with their horrific rural data coverage. There's no point in having a smart phone if it doesn't work without WiFi.
Update, in case anyone comes across this old post: Ovivo died last week, "for reasons beyond our control." Can't say I'm hugely surprised.
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