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Smart Client as in the phone VPN app? I'm pretty sure sure VPN Matcher hasn't got anything to do with that (happy to be corrected though!).

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Well I think my comment applies to that too...the whole point of VPN matcher is to try to get 'difficult to connect VPN's' working. Draytek's own client wouldn't usually fall into that category because it's so simple to use.

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Lol...actually no, on my previous post I was trying to ascertain whether you actually knew what client you were talking about.

But, OK, try actually telling us about the 'difficult network' config you're dealing with and then maybe somebody might have a clue about what's going on. (i.e. a little more than "SIM behind GNAT" - and is that actually CGNAT?)