I bought a Globalstar GSP-1600 on eBay and have been using it during December and January (367 grams with battery but no cables). Globalstar started a promotion for 50% more minutes and I decided to do the annual plan and try it out.
My wife also worries about my adventures, frequently a combination of traveling alone by jeep and hiking/backpacking, and I can let her know what I'm doing and have flexibility to change my trip plans daily.
With regard to the GSP-1700, the price is $1000, and it is now on the Globalstar USA homepage. I just received a flier from Globalstar giving $100 discount to existing Globalstar customers and $200 rebate if you turn in your old GSP-1600. This promotion goes through the end of June 07 ($100) and August ($200 rebate on old phone).
According to Globalstar, they have been repositioning satellites during December and January and so there will be more dropped calls than normal. They are also launching 4 more satellites in March and 4 more in May all of which should be relocated by August 07.
My experience thus far is mixed. You just never know when you'll get a clear strong signal and no signal, even at the same location. Last week I camped out at the Hall's Crossing Overlook in Utah to do a winter hike to Brimhall Arch. This is a pretty remote location where cell service just isn't possible. That night, I called with a four bar signal (the strongest). The next morning, about 11AM after returning from Brimhall, I tried calling from the same location (excellent sky visibility by the way). I couldn't get any signal after 10-15 minutes of waiting (I've discovered that sometimes it can take quite awhile before the signal strength comes in).
With regard to just using a few minutes for short calls, it may not be that successful. The time starts ticking for a call when they start trying to get the connection through (when it says "connecting…") not when it starts ringing or the person answers. Second, at least for me thus far, it is common to lose the signal during this process. This means you might try three times to call, never really be able to talk enough to get any message through, and waste three minutes of airtime easily.
Another consideration, when you use a satellite phone, you must have the antenna out and directed up and it needs a very clear view of the sky, not stuffed in your pack. This makes it difficult to receive calls. (Also, to receive/send calls in a vehicle requires additional hardware and installation.) So, what if your wife (or someone else) wants to contact you. The methods are voicemail and a short text message of 35 characters or less. The later is free for someone to send you with most plans. Neither can be done with the "emergency" plan that was suggested above paying $1.49 per minute.
Also, if you decide to go the eBay route, the phone must be activated by Globalstar. A dealer cannot do it. Second, Globalstar will check the account for the phone number, giving you the same number as before, and you may have serious problems if they think money is owed by the account with that phone number. I bought the phone from an individual that had hardly used the phone and had a perfect eBay record with a lot of transactions.
I hope this insight helps those of you contemplating satellite phones.
Craig Shelley