What does "roaming agreement" mean?

[Thunu]

English Language Tests, Intermediate level

ESL/EFL Test #161 "Mobile telecommunication expressions", question 1

You can receive, display, edit and/or send text messages on any network that has a ......... agreement.

(a) multimedia messaging service
(b) roaming
(c) short message service
(d) mailbox

English Language Tests, Intermediate level

ESL/EFL Test #161 "Mobile telecommunication expressions", answer 1

You can receive, display, edit and/or send text messages on any network that has a roaming agreement.

Correct answer: (b) roaming

Your answer was: incorrect
You can receive, display, edit and/or send text messages on any network that has a multimedia messaging service agreement.
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Dear Teachers

What does "roaming agreement" mean?

Thank you
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Reach an agreement as ploughing, don't let argument happen at crops.

[Torsten]

A roaming agreement is a contract between two or more mobile network providers. For example, if you have a cell phone plan that includes a roaming option your SIM card automatically registers your phone in the mobile phone networks of the foreign network operators when you travel abroad. In other words, you can use your mobile phone in different countries.

Hope this makes sense.
Thanks,
Torsten
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Thunu]

So can I replace this word by "multinational agreement"?

Thank you

Thu
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Reach an agreement as ploughing, don't let argument happen at crops.

[Torsten]

It depends on the context. A roaming agreement usually is a multinational agreement but in a very specific business context. The term 'multinational agreement' is usually used in a political rather than a business context.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary