First off... Jailbreaking is in NO WAY illegal. True... taking your iPhone into Apple for service w/ it being in a JB state it will void your warranty. However, if you restore your iDevice as new before taking in for service there will be no issues. Heck, we've had users here that've taken their iDevice in for service w/ a JB fully operational and have had the service completed and/or their phone even replaced.