Why can't my Sony Ericsson W8 10 reply to the short message during the call?

You're not texting while talking on the phone, are you?

If not, you can turn on the SMS function first, and then there is a setting at the bottom. After entering, press "SMS", and then you can find your friends who use Sony Ericsson to compare the settings and make changes.

If it doesn't work, just set it up on your mobile phone, press the "left" button directly, and then press it to find data communication-SMS access, and then let your friends lend it to you for comparison.

Hehe, good luck.