Apple invisible ink SMS can't be read

Apple invisible ink text messages can't be read. Need to check whether both parties are Apple phones to see if the 3D function is turned on.

1.The SMS special effect of iPhone indicates that both parties must be Apple devices, and the emoji is valid. These emoticons should be a piece of code, not a simple picture.

2. Check whether the 3DTouch function is turned on. Only when 3DTouch is turned on can you send SMS special effects.

3. Make sure that the weakened dynamic effect is not turned on in the low-power mode and auxiliary function, which will weaken the dynamic effect, and the invisible ink function cannot be used under the condition of weakening the dynamic effect.