Has anyone tried those stick on wallets?

[skidmark]

I need a wallet to hold business cards and i was thinking of buying the stick on variety that stick on the back of the phone, but the curve has me concerned.

Can anyone give me some advice on these?

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[skidmark]

I thought about those wallets, but I don't really care for those.

If they made a replacement back that can hold a few business cards that would be perfect.