Does switching a SIM card abroad causing any configuration troubles?

I would like to use a prepaid SIM card of a country I visit regularly to not pay the expensive abroad rates while traveling in the traveling country. Now I would like to know if the iPhone 5 will allow me to switch the SIM card once I am abroad without any configuration like sync with iTunes or other per requisites? Or does the iPhone gets confused when I am switching the SIM?
Thanks for sharing your experience.

Firstly your iPhone must by unlocked via your mobile network and Apple iTunes if your carrier allows it.
Now as to using a local sim in an unlocked iPhone - Yes there can be configuration issues with data, sms/mms and email.
The iPhone iOS does include the ability to set the APN settings necessary to get sms/mms working and Internet access however it also needs the sim card to support this function.
Many carrier sim cards do not and they hide this menu and try to auto configure the device.
Most of the time this is successful however not always.
Frequently the sms/mms settings are not correct meaning you may receive texts but are unable to send them whilst you have the foreign sim installed.
If the sim does supports manual configuration you will find the following menu item on your device at
settings/general/cellular/ CELLULAR DATA NETWORK.
Here you can add the correct setting for the mobile network by hand and turn off/on to set the profile.
If its not there you can not easily set these and may have to live with no sms/mms service for the duration or swap back your home card to send texts remembering roaming rates will be applied.
Now to the question of email again receiving should be no problem and imap sending should also work.
POP mail accounts however may fail to send .
You may be able to rectify this by changing smtp (Send) protocol to those of the host mobile network for the duration then resetting them when back on your normal sim and mobile networks.
So yes there can be networking issues to deal with !

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