Mtn Sim not working

Please I really need your help my MTN sim card 08140377099 is not working anymore and I'm out of the country and that's my business line I can't wait until I return back to...

My MTN stopped working and I couldn't received any messages, and I'm out outside Nigeria

I am in the United Kingdom. Recently, my mtn sim just stopped working on my phone. i tried all i could but didn't work, even on other phones, not working. I need to retrieve the...