Like you my previous phone was an HTC Desire which I was very happy with. However, due to the other half also liking it, I lost out (it’s now unlocked with a GiffGaff sim in it and working flawlessly). Sooo, one HTC One X later (thinking to myself HTC = good phone) here I am.
Do not touch this phone with a bargepole! Same service provider, same location indoors used over several months now and the reception ability of this model is in no way comparable to the Desire.
My daughter signed up for the Galaxy S3 on the same service provider as myself and the signal reception on hers is two bars greater with the phones side by side.
Shame really as I highly rated HTC with the Desire but I will not be going back to them once my contract is up after the One X experience.