Is it Sprint or my phone?

[mrmet044]

i currently have a HTC Evo shift. for the past week i have been getting tons of dropped phone calls, no signal, and roaming notifications. ive called Sprint everyday about this issue. they all told me it was due to the upgrade they were doing on my towers(for LTE). even though i explained to them it was happening everywhere i went. yesterday the rep told me that its not with Sprint it is my phone thats not working anymore. she even said they receive lots of complaints regarding this issue with HTC phones. my email and texting are working fine. just the call making/receiving issue is the problem. anyone else experience this. thanks