Phone won't detect network?

Sending a text mesage on my Nokia 2730c. Message began to send then activity icon froze. Message not sent. Then I noticed the signal bars had disappeared Checked phone status "No Signal". Tried sim card in my spare phone without any problem.
Anyone know if it's a fault with the antenna.
I've tried restoring factory settings and manually connecting to network - but no joy.
TomUK, February 2016


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