Signal issue

[gemz4the1]

I recently upgraded my sim only account to another sim only account.  I got a blank sim and swapped it (as I thought a new sim would improve my signal).

Maybe it is a coincidence but, at first my signal was loads better, but then it dropped quickly. 

Particulary when I'm at or near work, my signal seems blocked and the only texts I can send are iMessages through the wifi.  Even though my phone says that I have 2-3 bars of signal and 3G signal, I can't send normal texts or make calls (keeps saying call failed).  It doesn't say no service. The only way I can get my phone to work is if I reset it.

A few other people at work who are on O2 are having the same problem.

I have checked the signal in the area and it says it is fine.  Any ideas what the issue is?

I recently read an article online about EE having issues and O2 customer being unable to contact EE customers, however, I am trying to contact other O2 customers.

[Cleoriff]

Hi @gemz4the1 The issue you are talking about re EE and O2 was a major problem a couple of days ago

http://www.mirror.co.uk/news/technology-science/technology/ee-o2-mobile-networks-down-7160146

but we thought it had been resolved now?

You could check through this help link to see if you have ruled other problems out? http://community.o2.co.uk/t5/Pay-Monthly-and-Pay-Go/Self-help-guide-Is-the-network-down-for-me-or-ev...