add

Strides-APP/app/pages/member/ApplyMember.js

@@ -159,7 +159,7 @@ export default class ApplyMember extends Component {
               allowFontScaling={false}
               placeholder={$t('members.placeLast4Digits')}
               placeholderTextColor={textPlacehoder}
-              maxLength={50}
+              maxLength={4}
               //keyboardType='phone-pad'
               onChangeText={v => this.changeForm('membershipNo', v)}
             />