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Old Sep 22, 2015 | 4:16 pm
  #1127  
canadiancow
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Originally Posted by Sant
When set to Automatic, how do phones choose a mobile network? In both Barcelona, Spain and Santa Cruz, Ecuador, my iPhone 5S defaulted to MoviStar. In both cases, MoviStar ended up being the network which provided the worst experience and I had to manually choose a better network.
Last I looked into this (which, to be fair, was several years ago), the SIM card has a list of preferred roaming providers and it goes down that list, in order.

So in theory, getting a new SIM card could change the default. T-Mobile can also update this remotely.
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