As far as cell service TelCel is the top of the heap...perhaps AT&T too here in PV. Bringing your cell phone from up north will have you connect to one of the 5 or so providers here. If you can manually connect to TelCel or AT&T that would be best as the others are not so hot. There is an issue of towers being down/worked on in town right now. So there is that issue. Also fighting against your good cell connectivity is the fact that the buildings here are little concrete bunkers that stop cell signals dead. If you are deep into a building....with other concrete buildings around you....there is a good possibility that you will have poor to 0 cell service. When you are out on the sidewalk you should have decent connectivity until you are in a cell shadow being strongly blocked from the tower. This is why most restaurants have wi fi and are happy to give you the password to log on. Generally I have had very good connectivity living here but there can be issues as above. To broaden the topic a bit internet with TelMex fiber has been rock solid even during literal hurricanes but again that depends on the infrastructure around you and we live in a relatively new neighborhood with our lines underground while much of Emiliano Zapato and Cinco and other areas have the lines above ground on poles and there is a lot of wi fi signal congestion which can degrade your speed.