Wow guys chill out. Capricorn made an irrelevant statement and cycrosism responded with an equally irrelevant statement. It doesn't seem as if there was any "misbehavior" until the last 4/5 posts…
SRL is not money based (regardless of whether you use it to sell accounts/GP on another forum or beyond public sight on this forum), so no, it is nowhere near as illegal as wifi leeching/3G hacking. The lawsuits against other bots were mostly based on the profits they were making, and I believe the things Jagex brought up unrelated to profits and more to bots in general were mostly struck down. There's a reason warez, NSFW, etc aren't allowed on these forums. As for this thread, it seems as if it's more of a random question brought on by curiosity, not malicious intent.
From: Becks
They can, i use my iPhone to tether.
I believe Yohojo is asking why people don't use your computer directly with mobile internet for free, not via a phone working as a modem (therefore not free).
Back ontopic.. It seems to me that cycrosism is correct. An activated sim card (for GSM, not sure what CDMA phones use to identify a phone) is probably needed to be able to authenticate access to a carrier's network.