Re: iPhone5 unable to get signal since battery replacement yesterday - thoughts?
If you haven't yet, try preforming a network reset. You can do this simply by going into:
Settings > General > Reset > Network Reset
90% of time it fixes any kind of network issue for me. Other then erasing any of your wifi passwords saved into your device, your other data will be kept safe. However if that doesn't work, it's either an issue with your sim card or hardware that's causing the issue. To test your sim card simply take your sim card out of your phone, and swap it with a friends, or visit a Rogers store and have them swap it. If the issue persists with the working new sim card, then it's definitely the hardware and another trip to the apple store is required. If your worried about your warranty, don't. Apple guarantee's their repair/swap for 90 days.