This guide is designed for the Metro PCS version of the L70, but it should work for any version of the L70.
You retain all responsibility of
your phone, and should you brick it , that is
your fault. (Although I'm 99.9% sure you won't)
1. Go to
towelroot by geohot and download the tr.apk file (Click the Lambada)
2. Put said .apk file onto your phone and install (Need to have "Unknown sources" checked in the "Security" tab of your settings)
3. Press the "Make it Ra1n" button
4. Wait until your phone restarts (It will do so automatically)
5. Congratulations, your phone is now rooted!