Waterproof phone wallet/case

[Wooliferkins]

The lezyne phone wallet is very nice and is nominally "water resistant", if your phone is bigger than an Xperia Z it will not fit. The Caddy is again "resistant" but a little larger.

 

[ianrauk]

A resealable sandwich bag.
Has not let me down yet.

 

[Born2die]

I use a Tigra s3 case mounted on the bars great for the pratnav keeps my phone dry in the heaviest weather and is crash proof great bit of kit

 

[HLaB]

I got a neoprene like phone case that came free on the front of some cycling magazine, it'll not be 100% waterproof though

Edit: something like this.