It is more than two weeks that my Iphone6 cannot connect to LTE at 1800MHz. I am not your customer but according to IMEI I found that carrier is Verizon. I bought my phone in the US and it is SIM free. I talked to Apple several times and no problem was identified on their side. Also no problem with local carrier. The phone has never been damaged. Please help. Maybe there is something on your side that precludes my phone from accessing LTE. I was advised to contact you.