OK, I ask because tethering will accrue lots of data usage. If using Android I recommend using PDA Net. Its an app that you can download and can tether without Rooting a device. If you root a device there are wireless tethering apps to use.
Go to http://www.xda-developers.com/ and find the device you have and that will guide to many questions you may have.
I will be happy to help too, XDA has many talented individuals that know tons about this stuff.
jkbane (rep: 19) posted Oct 02, 2012
its a 3rd party firmware that will let you bridge two routers or in your case extend your wifi. search on google ddwrt and it should tell you if you can install it on your router. keep in mind that this voids your router warranty if you don't think you can to do it i recommend buying one off ebay.
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