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ISIS mobile wallet (not to be confused with the crazy ISIS group in the news lately) occasionally has some good promotions - for example, currently, they have a promo "Get $1 back on each purchase of $1 or more after you tap to pay with your American Express Serve Account in the Isis Wallet
Have you tried Isis on the Nexus 5? I attempted to install it from the Play store when I first got the phone. It didn't work and I never bothered trying to sideload or anything.

yeah im curious also why in the world u want to use ISIS over GW..GW is soo much better and works every single time..ive used ISIS for a while and its hit and miss.. plus adding funds to a card(serve card) and not having linked straight to a debit, credit, etc is a big downfall..
Since this is google flagship device, ISIS and other carrier additions aren't added in.
The phone ships with google wallet, and while I've never used ISIS it should essentially do the same thing.
Is there a particular reason for wanting to get ISIS on there?

How about $50 bonus if you open Amex Serve account from Isis (T-Mobile promo right now, I believe until the end of August)?
+ $1 cashback on any transaction of $1 or more made thru Isis Amex Serve up to $50/month until 12/31/2014?
there are $300 free right now.
my wife has Nexus 5. I took her sim card, put it into LG F6, opened the Amex Serve account and had $50 bonus in about two minutes.
now she wants her Nexus back.
which means that I cannot use it to get $250 left on the table.
too bad Google blocks Isis.
Google Wallet does not have any promotions like this.
there might be some technical issues, such as incompatible NFC module in the Nexus 5.