my iphone was on the microwave when it was turned on then my iphone could not connect to wifi what is the problem ?

The problem is that it was never recommended to put your device in the microwave.

Take a look at this Apple Support article:

https://support.apple.com/en-us/HT204051

Reset your network settings.

Settings - General - Reset - Reset Network Settings

Reset your device. This won't delete your data stored on the phone.

• Press and hold the Sleep/Wake button
• Press and hold on the Home button
• Keep holding both buttons until the display turns off and back on with Apple logo on it.

Alternatively, you may go to Settings - General - Reset - Reset All Settings

The problem is that you microwaved your phone. Not only have you destroyed your phone, you've probably also destroyed the microwave. There is absolutely no sensible reason a phone should ever be in a microwave.

Make an appointment at the Genius Bar at your local Apple Store and see if they will offer you an out of warranty replacement.

If the phone was simply on the microwave when you turned it on, that should have had no effect on the phone.

LexSchellings wrote:

You did say on the microwave, did you mean in the microwave? How long did you "cook" the iPhone?

Good catch, Lex. I read it as "in". "On" shouldn't have any effect on the phone.

You did say on the microwave, did you mean in the microwave? How long did you "cook" the iPhone?

Did you leave it on the microwave, or put it in the microwave

"Leaky" shielding? (Still doesn't seem possible) [ the "o" and the "i" ARE right next to each other on a QWERTY keyboard! ] 😕

all our posts crossed each other. Let's wait and see what the OP says.