I recently tried to force my nexus-s to use a 3G network in an area where it kept swapping between 2g/3g coverage… This can be done via a ‘hidden’ phone menu which you can access by dialling:

*#*#4636#*#*

Go to ‘Phone Information’ and then you can select your preferred network or lock it to WSCMDA Only in my case. The down side of doing this as I discovered 48 hours later is that I now couldn’t send any SMS messages at all. The phone would fail with ‘message cannot be sent’ and reboots, restarts or plugging in settings in the APN sections of the phone accomplished nothing.

A quick call to Optus revealed that this wasn’t a change on their side so it was clearly something to do with the settings I had messed with.

After a lot of trial and error it turns out that the problem was my Optus Message Centre had somehow been reset, the solution is to enter it again in the same menu.

1. Dial *#*#4636#*#*
2. Goto Phone Information and then find the section SMSC and you need to enter the Optus SMSC number which is +61411990001. However this still won’t work as you need to convert this to hexadecimal PDU which is apparently what the nexus-s speaks… to do this:

3. Use the form on this page: http://www.twit88.com/home/utility/sms-pdu-encode-decode
4. So for Optus you would generate the following HEX PDU: 07911614910900F1110000910000AA00, the code you actuall enter is 07911614910900F1 (the rest is just timestamp stuff and can be ignored).
5. Hit ‘update’

Finally you can send messages again!

Nexus-s fails to send SMS
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5 thoughts on “Nexus-s fails to send SMS

  • April 30, 2011 at 11:22 am
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    the link doesnt work anymore!

  • August 13, 2011 at 10:17 am
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    Glad I found this website from Google! I also did the EXACT same thing as you here in Canada on Wind Mobile. Kept switching to ROAMING mode so I forced WCDMA only and now I can’t send any outgoing SMS at all! Buggered it right up!

    Hopefully this fixes it for me too! Cheers!

  • December 28, 2011 at 8:57 am
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    Thank you for this post!

  • November 17, 2014 at 11:49 pm
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    I tried all this for a while but when I entre the hex pdu and say update it says update error

    i am on vodaphone maharashtra india mumbai

    my smsc no is +919820005444
    the hex pdu comes out to be 0791198902004544

    I am using the oneplus one phone.

    since update of textra, hangout and go sms pro the editable smsc no field is vanished and my sms are not going out please help someone.

    vodaphone india is saying they are help less you find your own solution we are technically incompetant

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