I had 3 mobile and yes my signal would just cut completely, often just as i asnwered a call!
They are useless! Even the store we bought the phones from wouldnt speak to the customer service lines as they were foreign call centres.
We had 2 phones contracts taken at same time, one we said mustve have an answerphone service at all, they kept turning it on and off and we'd miss important calls.
We went abroad and called to ensure both mobiles would work, only one was activated when we called so the activated the other. When we got to france we found that theyd activated one and cancelled roaming on the other. It took 3 days and 2 hours of calls to get it back on, they refused to refund us the cost of the calls to them. oh and then, when the contracts came to an end they continued to invoice us and threaten us with court action, good job Id cancelled direct debits.
I will NEVER take out another contract with them!