Most of us get into Second Life using a computer, usually a pretty powerful one. But there are ways to use a mobile device -- a tablet or a smartphone -- to get into SL. There's a text-only app, Pocket Metaverse, for the iPhone. For Android devices, there is Mobile Grid Client, another text-only app, and Lumiya, which gives you a rudimentary graphics interface.
Last year, OnLive provided "SL Go." This subscription service uses OnLive's servers to provide the graphics muscle needed to run a fully-realized version of SL on machines that don't have the performance necessary to run a "regular" Second Life viewer. An unlimited subscription costs $9.95 per month. It works with iPads and with Android-based tablets and smartphones.
But Sony has acquired OnLive, and last week they announced that SL Go would be closing at the end of April.
If you would like to contribute your voice to try and reverse this decision, there is a petition you can sign. Go to this link and let your voice be heard! Frankly, there's not much chance of success, but it would be a shame for us to lose this way of letting people visit our virtual world.
If you haven't tried SL Go, you still have a few weeks. It's free to use until the closing date of April 30.