So I've seen here that you can transfer your old AT&T Unlimited plan from your old iPad to the new one, and apparently someone said earlier you have to change the IMEI numbers somewhere and change serial numbers etc. But I don't think anyone has actually detailed out the process that myself and many others will be going through tomorrow. For anyone who has transferred their UNLIIMITED iPad Acct, can you list exactly how to do that? Obviously there's still a couple weeks on the old plan, but my understanding is that if you had unlimited 3G, you can convert it to unlimited 4G. Any help?