On the mobile phone, you can use mathematical input method or special character input method to input mathematical symbols. For parallel and equal symbols, you can enter them as follows:

1. Open the keyboard of mathematical input method or special character input method.

2. Find and select parallel symbols (such as "∨");

3. Enter parallel symbols.

4. Find and select the equal sign (such as "=").

5. Enter the equal sign.

Explanation: In mathematics, the parallel symbol "∨" means that two straight lines are parallel, and the equal sign "=" means that two numbers or expressions are equal. By inputting these two symbols, you can express a parallel and equal relationship on your mobile phone.

Extended content: In addition to parallel and equal sign, other mathematical symbols can be input on the mobile phone, such as plus sign+,minus sign-,multiplication sign×, division sign \ or special character input method, which provides rich mathematical symbol options for users to express and calculate mathematics on the mobile phone. At the same time, you can also input complex mathematical symbols and formulas by inputting mathematical formulas in a text editor or mathematical software, and then copying and pasting them on your mobile phone.