Not sure what you mean here?
You are talking about a different .xml file. Maybe Chatty uses the file that I referenced, not the one that you referenced.
You should confirm though your exact mcc and mnc - which you can get using tips on the above-linked page.
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The odd thing is that in the file serviceproviders.xml I find Telia MMS credentials under Multicom:
<name>Multicom Security</name>
<gsm>
<network-id mcc="240" mnc="01"/>
<network-id mcc="240" mnc="05"/>
<!-- http://multicomsecurity.se/produkter-tjanster/mobil-datakommunikation/mobiflex/ -->
<apn value="mobiflex.telia.se">
<plan type="postpaid"/>
<usage type="internet"/>
<name>Mobiflex</name>
</apn>
<apn value="mms.telia.se">
<usage type="mms"/>
<name>Telia MMS</name>
<mmsc>http://mmss/</mmsc>
<mmsproxy>193.209.134.132:80</mmsproxy>
</apn>
</gsm>
whereas under Telia it reads:
<name>Telia</name>
<gsm>
<network-id mcc="240" mnc="01"/>
<network-id mcc="240" mnc="05"/>
<voicemail>*133#</voicemail>
<balance-check>
<ussd>*120#</ussd>
<ussd>*121#</ussd>
</balance-check>
<!-- http://www3.telia.se/foretag/mobilguiden/ -->
<apn value="online.telia.se">
<plan type="postpaid"/>
<usage type="internet"/>
<name>Telia 3G</name>
</apn>
</gsm>
there is no MMS info and a reference to some old url (“http://www3.telia.se/foretag/mobilguiden/”) that doesn’t seem to exist anymore.
So, if I hack in the MMS info under the <name>Telia</name> tag, would it likely work then?
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No idea! But just save a copy of the file before you start hacking away at it. I don’t think much can go wrong as long as you aren’t relying on remote access via the cellular modem in order to get into the phone. 
You should confirm your mcc and mnc - and I don’t know how the duplicates are handled.
It didn’t make a notable difference. No MMS being sent, unless I activate the MMS APN in gnome-settings, which then breaks mobile data as Telia has different APNs for mobile surf and MMS as @Skalman pointed out above.
And this one is still missing from serviceproviders.xml:
SFR France added already?
I guess that file isn’t used by pureos. The correct credentials seem to be in /usr/share/mobile-broadband-provider-info/apns-conf.xml
However, as long as Telia Sweden keeps different APNs for mobile data and MMS I have to do the workaround discussed here. At least until pureos will be able to handle to different APNs at the same time.