The modem is already certified. And the antenna is also cerified. I don't see any use in doing a quite expensive cert for both again (btw 5000$ will definitely not suffice, it's rather 4 times as much, maybe more, incl. all procedures and action to get accomplished). What you're asking is like asking for a CE cert for the particular combination of an incandescent bulb (already type approved CE) in a particular desk lamp (also already CE approved), just because we screwed that new bulb into the lamp. Or like requesting a new FCC cert for an USB UMTS stick plugged in to your laptop - which is basically exactly what we do.
And btw Linx is selling RF modules (e.g. for ISM radios, remote controls, etc pp) Those are of course NOT precertified by FCC or other authorities. PHONE modules OTOH of course are usually fuly type approved. So the whole Linx reasoning about FCC and what it costs etc is really not applying here. Approval of GSM and similar technology transmitters is WAY more complex and expensive than for simple RF-modules. But luckily you can see in the docs that the cinterion modules ARE approved.

A VERIFICATION of SAFETY for humans is something that scientists and pseudo-scientists are working on since I guess 30 years now, and so far no evidence has been found and commonly accepted as true, for or against any harm done by GSM RF. WE definitely can't do that, and won't try to. However if you're feeling concerned about hazardous radiation from mobile phones, I suggest you don't use Neo900, it is exactly as bad (or not bad) as any other phone. The differences are negligible.

For the general safety of the device, not regarding SAR, there's the CE cert which we of course will get for Neo900.

/j