Fixing China Unicom 3G SMS Sending Failures on Android 4.0

Word is Android 4.0 was so new that you often had to set things up by hand just to receive texts.

Dial ##4636## Phone information —— SMSC Look up the SMS center number for your region and carrier (China Unicom or China Mobile). Say the center number is   +86 13 01 07 61 50 0   then your SMSC value is 68 31 10 70 16 05 f0 That is, split it into pairs, swap the two digits in each pair, and pad the last odd one with f. The + becomes 0891. So type 0891683110701605f0 into SMSC, hit Update, and back out to the home screen. Dial ##4636## again, go to Phone information —— SMSC, tap Refresh. If it shows the same number you entered, you can send texts now.