[G1 General] haykuro:
Why does everyone keep saying these are hidden?

They are easily accessible through /system/etc/apns-conf.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
/*
** Copyright 2006, Google Inc.
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
-->

<!-- use empty string to specify no proxy or port -->

<apns version="6">
<apn carrier="T-Mobile US"
mcc="310"
mnc="260"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<apn carrier="T-Mobile US 250"
mcc="310"
mnc="250"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<apn carrier="T-Mobile US 660"
mcc="310"
mnc="660"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<apn carrier="T-Mobile US 230"
mcc="310"
mnc="230"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<apn carrier="T-Mobile US 310"
mcc="310"
mnc="310"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<apn carrier="T-Mobile US 580"
mcc="310"
mnc="580"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<apn carrier="T-Mobile US 240"
mcc="310"
mnc="240"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<apn carrier="T-Mobile US 800"
mcc="310"
mnc="800"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<apn carrier="T-Mobile US 210"
mcc="310"
mnc="210"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<apn carrier="T-Mobile US 160"
mcc="310"
mnc="160"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<apn carrier="T-Mobile US 270"
mcc="310"
mnc="270"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<apn carrier="T-Mobile US 200"
mcc="310"
mnc="200"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<apn carrier="T-Mobile US 220"
mcc="310"
mnc="220"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<apn carrier="T-Mobile US 490"
mcc="310"
mnc="490"
apn="epc.tmobile.com"
user="none"
server="*"
password="none"
mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc"
/>

<!-- T-Mobile Europe -->

<apn carrier="T-Mobile UK"
mcc="234"
mnc="30"
apn="general.t-mobile.uk"
user="t-mobile"
password="tm"
server="*"
mmsproxy="149.254.201.135"
mmsport="8080"
mmsc="http://mmsc.t-mobile.co.uk:8002"
/>

<apn carrier="T-Mobile D"
mcc="262"
mnc="01"
apn="internet.t-mobile"
user="t-mobile"
password="tm"
server="*"
mmsproxy="172.028.023.131"
mmsport="8008"
mmsc="http://mms.t-mobile.de/servlets/mms"
/>

<apn carrier="T-Mobile A"
mcc="232"
mnc="03"
apn="gprsinternet"
user="t-mobile"
password="tm"
server="*"
mmsproxy="010.012.000.020"
mmsport="80"
mmsc="http://mmsc.t-mobile.at/servlets/mms"
type="default"
/>

<apn carrier="T-Mobile A MMS"
mcc="232"
mnc="03"
apn="gprsmms"
user="t-mobile"
password="tm"
server="*"
mmsproxy="010.012.000.020"
mmsport="80"
mmsc="http://mmsc.t-mobile.at/servlets/mms"
type="mms"
/>

<apn carrier="T-Mobile CZ"
mcc="230"
mnc="01"
apn="internet.t-mobile.cz"
user="wap"
password="wap"
server="*"
mmsproxy="010.000.000.010"
mmsport="80"
mmsc="http://mms"
type="default"
/>

<apn carrier="T-Mobile CZ MMS"
mcc="230"
mnc="01"
apn="mms.t-mobile.cz"
user="mms"
password="mms"
server="*"
mmsproxy="010.000.000.010"
mmsport="80"
mmsc="http://mms"
type="mms"
/>

<apn carrier="T-Mobile NL"
mcc="204"
mnc="16"
apn="smartsites.t-mobile"
user="*"
password="*"
server="*"
mmsproxy="010.010.010.011"
mmsport="8080"
mmsc="http://t-mobilemms"
type="default"
/>

<apn carrier="T-Mobile NL MMS"
mcc="204"
mnc="16"
apn="mms"
user="tmobilemms"
password="tmobilemms"
server="*"
mmsproxy="010.010.010.011"
mmsport="8080"
mmsc="http://t-mobilemms"
type="mms"
/>
</apns>