Are you an MTN Nigeria Customer and you want to roam in the
United States with your MTN line? Below are the requirements and procedures to
take before roaming.
Requirements and Phone Specification for Roaming on AT&T in United States

Requirements:

First of all, roaming MUST be on AT&T network provider. You
can manually search for the network if your phone failed to automatically
register the network.
Secondly, your device must be either be on 3G or 4G as 2G
network no longer exist.
Your phone must have network frequency of 1700/2100 MHz,
because that is what AT&T network uses.
It is recommended that you use a single sim phone to roam.
But in the event you want to use you dual SIM phone, ensure you enable your MTN
sim for data service on 3G/4G mode.
Note: As
recommended in the above, if your MTN SIM is on 3G/4G mode, in most devices,
the second slot will automatically be on 2G, hence cannot work on AT&T
network.
If you are having any other issue related to the subject
matter, simply dial 180 from an MTN line, 23480310180
from other networks in Nigeria and +23480310180
from outside the country.
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