Thanks for getting in touch with us!
I'm sorry to hear you're experiencing issues with your signal. You can pop over to https://myaccount.ee.co.uk/networkchecker/checkservice, input your postcode and check the area for any issues.
I would also advise to re-boot the handset by turning it off and removing the SIM card.
If the issue persists, be sure to get in touch with us by calling 500 free from the SIM, 0800 079 1133 from another handset or catching us on our Live Chat feature over at www.plus.net and we'll investigate further.