Can a phone really be unlocked by software or code?

yeah i know there is a million post about unlocking a phone but here are a few questions.

#1 if i go and buy a cell phone from AT&T will it have a SIM card that can be removed or is it fixed into the phone?

#2 if the SIM card is removable can i just place it in a another phone and use it with my AT&T account?

#3 if none of the above are right can i buy two unlocked phones and switch between the two and use them with my AT&T account?

basically i want to have two cell phones that i can switch between and use on the AT&T network not at the same time of course. How can i accomplish this?

Thanks

---

› See More: Can a phone really be unlocked by software or code?

As you're probably aware, this doesn't apply to the iPhone. Although there are rumors that the separate SIM card that ships inside the iPhone can be taken out and added to another (GSM only) carrier.

Interesting, hadn't heard about that. If they can extract the SIM card, maybe they can extract the battery too, instead of sending it to Apple to replace hehe.

Get an iPhone for $10.