You can browse for free with TroidVPN Android mobile app if you are ready to browse free using MTN, Airtel and other mobile networks in Nigeria then get TroidVPN. Meanwhile, I will be providing the free browsing settings you can use to set up the app to be able to browse for free.

Tunnelguru just launch troidvpn (BETA)
100% free no registration required. but only
works with android version 4.xx... other
version coming soon
visit:
http://troidvpn.com/ to download the
apk file (preconfigured)
TroidVPN : Free VPN For Android .
Minimum v 4.0.4 : Without Rooting. Daily
1 GB Download/Upload Free with Full
speed. NO REGISTRATION REQUIRED.
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