I use prepaid sim card. Phone doesn't work When I am into the building. I am in vancouver. I can't use date and message, call service when I am in the building. It doesn't my phone's problem. because I have two phone with koodo prepaid sim card. how can i do?
It could be a Sim card or phone issue still. You can swap the Sim cards in both phones to see if the problem follows the Sim card or not. You can also reset network settings on your phone with the issue to see if that will fix it but that will remove wi-fi and Bluetooth passwords and pairings. Also do both phones use the same network when in the building or is one 3G/ h/ h+ / w cdma etc and the othrr 4g/lte? There could be a weak lte signal in that building. Try to use w cdma or 3g in network settings to force on the network with better reception in general.
If your saying when you enter the building you lose signal, that's a phone issue, or just because of the building itself. If your other phones are working in the building then it's either the buildings walls and internals that are blocking the signal, or your phones antenna is weak and you may need a new phone.
In my experience, my local grocery store has the same problem with no signal in the building but only with my old LG G3. As soon as I got my S7Edge, I was able to get signal in the building.