Entry #29 is probably too detailed for us and may not hold up at small sizes but your phone icon looks great. #30 checkmark wouldn't work because it indicates a different type of form. We really like #28.
These are all really promising. I like the idea of leaving the phone icon blank - perhaps we reduce the size of the phone just a little. Also, can you submit a logo with the @ as an 'a' - we're debating internally on whether to go for the 'a' or '@' - so it will be good to have both options. Thanks again for this great work!