Given that all Apps in the itunes store have to be reviewed and approved by apple, I don't know that any real moneygambling apps will ever get approved. The rush poker mobile App on FTP used to work great on my droid until all the crap went down and they stole our money.
There are several incl Switch but none are U.S. friendly so best option is to use a remote desktop app which will let you access your pc or mac from anywhere in the world even when it's switched off and play your usual poker rooms .