Water damage

No iPhone is waterproof.

Water resistant is not the same thing.

The 30 minutes thing is how the device was tested under laboratory conditions, it is not a suggestion for real world use.

https://support.apple.com/en-us/HT207043

To prevent liquid damage, avoid these:

• Swimming or bathing with your iPhone
• Exposing your iPhone to pressurized water or high velocity water, such as when showering, water skiing, wake boarding, surfing, jet skiing, and so on
• Using your iPhone in a sauna or steam room
• Intentionally submerging your iPhone in water
• Operating your iPhone outside the suggested temperature ranges or in extremely humid conditions
• Dropping your iPhone or subjecting it to other impacts
• Disassembling your iPhone, including removing screws

You have damaged the screen.

Contact Apple support to see what your options are

Unfortunately, your phone was liquid damaged, regardless on the amount of time it was submerged (partially or fully). Apple's 1-year hardware warranty does not cover this type of damage. If you elected to get an AppleCare+ plan with this phone, and it is still active, you may be able to get a replacement phone at a reduced cost.

Using rice, or any other form of desiccant, will not help. The reasons is, even if the rice could absorb all of the liquid, any trace minerals in the liquid would be left behind and potentially cause short-circuits. This can result in potentially further damage with continued use of the phone.

No iPhone is waterproof.

You also wasted the rice.