ios 7 beta 2 upgrading

Hello folks!
So, i am new to this forum so i am sorry if i get something wrong in my first post but i will try my best.
With ios 7 beta 2 that just came out i would really like to register my udid and download it to my iphone 5, the problem is that in a few days i will be going in another house where i don't have access to my pc, so i am worried that if i download it now and the beta 3 comes out beta 2 will expire and my iphone will be blocked till i get back home. Sooo this is my question: can i download the next beta directly from my iphone if i register my udid? Aaand also do you think that all this process is risky or not?

thanks in advance.
Cesare

 

p.s. will upgrading to ios 7 void my warantee?