For API level 8 or above : Validation for a cell number in Android http://stackoverflow.com/questions/5958665/validation-for-a-cell-number-in-android

IsPhoneNumber.java

public boolean isPhoneNumber(String number) {
    if (number == null || TextUtils.isEmpty(number)) {
        return false;
    }
    // return Pattern.matches(PHONE_NUMBER_PATTERN, number.replace("-", ""));
    return android.util.Patterns.PHONE.matcher(number).matches();
}