To be very exact, I ordered this with 120min pre-paid units (minutes). - expires in december 2014 as I recall, that's okay with me.
http://www.globaltelesat.co.uk/satphone ... nutes.html
Also they offer free sms -> Phone from their website, and they also offers "some" tracking functionality - it's not as sophisticated as from the competition though, I'll look in to that as some point before our trip in may, this is great news for our concerned family
The price is
£468.00 Including VAT at 20% hence inside EU, you will not (I didn't) have to pay any tax in NL - shipping is 30£ with TNT and T&T - mine took about 4-5 days to arrive incl. a weekend, so pretty it's fast. According to globalsat - the price on the phone is about to rise so (if one can trust a seller

) maybe you should get yours asap. - but please don't blame me if he just pulled a "sales trick" on me.
I believe you are running a company, so you'll be able to deduct tax either way (UK or NL TAX)
IMHO, compared to competition, this is indeed a bargain, and the sat coverage is more than sufficient for travels in Africa.