Are there parental blocks on iPhones?

Like on the Instagram & tumblr apps?

No, there are not.

To enable Parental Controls - or Restrictions - click on Settings, then General and scroll down to Restrictions.

Click on this and then Enable Restrictions. If this is the first time you have accessed this feature you will be prompted to enter and re-enter a four-number passcode.

Then you will arrive at the Restrictions control panel where you can choose which applications can be used as well as the level of access to rated content such as movies, music and applications.

If you don't have an iPhone 4, it will hopefully still work, just try it!
Sorry I couldn't make up my own answer, have to go out in a minute.

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