diff --git a/layers/cellular.js b/layers/cellular.js
new file mode 100644
index 0000000..90481be
--- /dev/null
+++ b/layers/cellular.js
@@ -0,0 +1,127 @@
+import { XYZ } from 'ol/source.js';
+import TileLayer from 'ol/layer/Tile';
+
+// from https://stackoverflow.com/q/32454234
+var quadkey = function (x, y, z) {
+    var quadKey = [];
+    for (var i = z; i > 0; i--) {
+        var digit = '0';
+        var mask = 1 << (i - 1);
+        if ((x & mask) != 0) {
+            digit++;
+        }
+        if ((y & mask) != 0) {
+            digit++;
+            digit++;
+        }
+        quadKey.push(digit);
+    }
+    return quadKey.join('');
+};
+
+const cellular_layers = {
+    name: "Cellular Providers",
+    layers: [
+        // {
+        //     name: "Verizon",
+        //     // enabled: true,
+        //     layer: new VectorTileLayer({
+        //         source: new VectorTileSource({
+        //             format: new MVT(),
+        //             // https://api.mapbox.com/v4/gismaps.3knn09ds,gismaps.2x81tn8t,mapbox.mapbox-streets-v8,gismaps.aq7mk519,mapbox.country-boundaries-v1,gismaps.cbihlc9h,gismaps.7is2087g,gismaps.8hjkv530/7/31/46.vector.pbf
+        //             // url: 'https://basemaps.arcgis.com/arcgis/rest/services/World_Basemap_v2/VectorTileServer/tile/{z}/{y}/{x}.pbf',
+        //             url: 'https://api.mapbox.com/v4/gismaps.3knn09ds,gismaps.2x81tn8t,mapbox.mapbox-streets-v8,gismaps.aq7mk519,mapbox.country-boundaries-v1,gismaps.cbihlc9h,gismaps.7is2087g,gismaps.8hjkv530/{z}/{y}/{x}.pbf'
+        //         }),
+        //     }),
+        // },
+        {
+            name: "AT&T Domestic",
+            layer: new TileLayer({
+                opacity: 0.5,
+                source: new XYZ({
+                    tileUrlFunction: function (tileCoord, pixelRatio, projection) {
+                        var z = tileCoord[0];
+                        var x = tileCoord[1];
+                        var y = tileCoord[2];
+                        return "https://geolink-igw.cloud.att.com/mapservice/quadkeytile?layer=attDomestic&quadkey=" + quadkey(x, y, z);
+                    },
+                }),
+            }),
+        },
+        {
+            name: "AT&T Prepaid",
+            layer: new TileLayer({
+                opacity: 0.5,
+                source: new XYZ({
+                    tileUrlFunction: function (tileCoord, pixelRatio, projection) {
+                        var z = tileCoord[0];
+                        var x = tileCoord[1];
+                        var y = tileCoord[2];
+                        return "https://geolink-igw.cloud.att.com/mapservice/quadkeytile?layer=attPrepaid&quadkey=" + quadkey(x, y, z);
+                    },
+                }),
+            }),
+        },
+        {
+            name: "AT&T International",
+            layer: new TileLayer({
+                opacity: 0.5,
+                source: new XYZ({
+                    tileUrlFunction: function (tileCoord, pixelRatio, projection) {
+                        var z = tileCoord[0];
+                        var x = tileCoord[1];
+                        var y = tileCoord[2];
+                        return "https://geolink-igw.cloud.att.com/mapservice/quadkeytile?layer=attIntl&quadkey=" + quadkey(x, y, z);
+                    },
+                }),
+            }),
+        },
+        {
+            name: "Sprint 5G? (may also be T-Mo now); see <a href='https://coverage.sprint.com/IMPACT.jsp'>Sprint</a> for legends",
+            layer: new TileLayer({
+                opacity: 0.5,
+                source: new XYZ({
+                    // url: 'https://coverage.sprint.com/MapTile/5GDataMap/Tiles/data_xp_5G/{z}/{x}:{y}/tile.png'
+                    tileUrlFunction: function (tileCoord, pixelRatio, projection) {
+                        var z = tileCoord[0]+1;
+                        var x = tileCoord[1]+1;
+                        var y = tileCoord[2]+1;
+                        return `https://coverage.sprint.com/MapTile/5GDataMap/Tiles/data_xp_5G/${z}/${x}:${y}/tile.png`;
+                    },
+                }),
+            }),
+        },
+        {
+            name: "Sprint LTE? (may also be T-Mo now)",
+            layer: new TileLayer({
+                opacity: 0.5,
+                source: new XYZ({
+                    // url: 'https://coverage.sprint.com/MapTile/5GDataMap/Tiles/data_xp_lte/{z}/{x}:{y}/tile.png'
+                    tileUrlFunction: function (tileCoord, pixelRatio, projection) {
+                        var z = tileCoord[0]+1;
+                        var x = tileCoord[1]+1;
+                        var y = tileCoord[2]+1;
+                        return `https://coverage.sprint.com/MapTile/5GDataMap/Tiles/data_xp_lte/${z}/${x}:${y}/tile.png`;
+                    },
+                }),
+            }),
+        },
+        {
+            name: "Sprint non-LTE? (may also be T-Mo now)",
+            layer: new TileLayer({
+                opacity: 0.5,
+                source: new XYZ({
+                    // url: 'https://coverage.sprint.com/MapTile/5GDataMap/Tiles/data_xp_5G/{z}/{x}:{y}/tile.png'
+                    tileUrlFunction: function (tileCoord, pixelRatio, projection) {
+                        var z = tileCoord[0]+1;
+                        var x = tileCoord[1]+1;
+                        var y = tileCoord[2]+1;
+                        return `https://coverage.sprint.com/MapTile/5GDataMap/Tiles/data_xp_3G/${z}/${x}:${y}/tile.png`;
+                    },
+                }),
+            }),
+        },
+    ],
+};
+
+export default cellular_layers;
diff --git a/layers/index.js b/layers/index.js
index eef17c8..674c962 100644
--- a/layers/index.js
+++ b/layers/index.js
@@ -10,6 +10,7 @@ import chains from './chains/index.js';
 import census_bureau from './census-bureau/index.js';
 import states from './states/index.js';
 import national_land from './national-land/index.js';
+import cellular from './cellular.js';
 
 const layerCategories = [
     { // Base maps
@@ -77,6 +78,7 @@ const layerCategories = [
     census_bureau,
     states,
     national_land,
+    cellular,
 ];
 
 export default layerCategories;