This mini-rant came on the heels of an interesting twitter discussion: https://twitter.com/kennwhite/status/591074055018582016
Provider / "Secret" Key
GoldenFrog / thisisourkey
GFwVPN / gfwvpn
VPNReactor / VPNReactor
UnblockVPN / xunblock4me
IBVPN / ibVPNsharedPSK!
Astril / way2stars
PureVPN / 12345678
PrivateInternetAccess (PIA) / mysafety
TorGuard / torguard
IPVanish / ipvanish
EarthVPN / earthvpn
NordVPN / nordvpn
*Honorary mention in the VPN Hall of Shame, on general principle (for blatant sexism and utter insincerity): DoubleHop.me
Moral of the story: Don't believe everything you read on, say, TorrentFreak and PCMagazine. And (crucially) think about your threat model—are you guarding against amateur WiFi snoops at Starbucks or Marriott? Reducing identity monetization profiling by ISPs (ie ad tracking)? Minimizing exposure to government surveillance? Trying to be anonymous online? If the latter, a VPN won't help much.
Citations:
https://www.google.com/#q=goldenfrog+thisisourkey Archive: http://archive.is/qlrLK
http://www.gfwvpn.com/?q=node/224 Archive: http://archive.is/EdpFV
https://www.vpnreactor.com/android_l2tp_ipsec.html Archive: http://archive.is/uwJvk
http://unblockvpn.com/support/how-to-set-up-l2tp-on-the-android.html Archive: http://archive.is/4To5Y
http://www.ibvpn.com/billing/knowledgebase/34/Set-up-the-VPN-connection-on-Android-handsets.html Archive: http://archive.is/srptW
https://www.astrill.com/knowledge-base/50/L2TP-IPSec-PSK---How-to-configure-L2TP-IPSec-on-Android.html Archive:http://archive.is/PZpRU
http://billing.purevpn.com/knowledgebase.php?action=displayarticle&id=33 Archive: http://archive.is/R4JTi
https://www.privateinternetaccess.com/pages/client-support/ Archive: http://archive.is/U1bkL
http://torguard.net/knowledgebase.php?action=displayarticle&id=58 Archive: http://archive.is/iKJjl
https://www.ipvanish.com/visualguides/L2TP/Android/ Archive: http://imgur.com/IQU1mdg
http://www.earthvpn.com/android-l2tp-setup-guide/ Archive: http://archive.is/roKtf
https://nordvpn.com/tutorials/android/l2tpipsec/ (scroll down) Archive: http://archive.is/BQumt
*DoubleHop.me: Archive:http://archive.is/G11WQ and http://archive.is/MZgWE and http://imgur.com/Zn5HSIj