React Native Linking SMS

there's a difference between the platforms with the "body" divider you can use the following code to make it work:

function openUrl(url: string): Promise<any> {
  return Linking.openURL(url);
}
export function openSmsUrl(phone: string, body: string): Promise<any> {
  return openUrl(`sms:${phone}${getSMSDivider()}body=${body}`);
}
function getSMSDivider(): string {
  return Platform.OS === "ios" ? "&" : "?";
}

Have you considered and tried sms:number?body=yourMessage?

You can read up on it in RFC 5724.

I created a hook to send SMS messages:

import { useCallback } from 'react'
import { Linking, Platform } from 'react-native'

export default () => {
  const onSendSMSMessage = useCallback(async (phoneNumber, message) => {
    const separator = Platform.OS === 'ios' ? '&' : '?'
    const url = `sms:${phoneNumber}${separator}body=${message}`
    await Linking.openURL(url)
  }, [])

  return onSendSMSMessage
}