I think so, Im not sure but ive done it.
you can go talk to Sensei and press competition mode and that will help you get belts much much faster.
you choose safe mode when you get a name
change your chat mode from Ultimate safe chat to Standard safe chat
There is no "practice mode" or training mode in BF3; in fact, there hasn't been one since BF 1943. However, what you CAN do is rent your own server, then set it to private and do whatever you want to do for training or practice.
yes there is
no, airplane mode cuts you off from service, and you need service to receive text messages.
Yes.
Competition mode. If you win or lose you still get progress you just get more if you win
To access practice mode in "N," start by selecting a level from the main menu. Once in the level, look for the option to enter practice mode, which typically allows you to restart the level from checkpoints without losing progress. This mode lets you experiment with different strategies and refine your skills. Remember to save your progress frequently to track your improvements!
Pretty much you have to go through the story mode and/or make your own.
PRACTICE!
Lots of Practice. Unless ur zobros