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Image:Area code 641.svg|300px|right|The area colored red indicates the region served by area code 641 within the state of Iowa, poly 441 309 416 289 398 289 400 269 416 261 416 253 409 246 391 249 392 243 409 234 416 220 384 218 384 211 379 207 385 179 381 171 371 172 363 154 347 147 342 126 336 124 350 107 360 109 379 97 393 109 385 120 403 113 419 117 416 141 422 148 467 147 465 160 451 160 449 181 443 190 449 205 442 217 461 225 456 234 469 245 468 261 452 272 456 280 441 289 441 308 441 309 Area code 319 poly 372 49 445 54 446 62 459 67 456 74 449 82 453 100 461 116 475 124 479 130 510 175 515 185 501 190 498 205 483 216 467 216 456 225 443 216 447 200 446 190 451 182 452 162 461 161 466 159 466 148 425 149 416 143 416 116 404 112 388 123 394 109 378 98 387 67 371 54 373 49 372 49 Area code 563 poly 256 54 256 65 246 93 240 98 240 104 256 103 256 109 245 122 256 132 249 146 249 155 238 164 244 168 248 185 271 186 268 210 256 217 256 232 276 246 290 227 298 240 307 245 306 231 329 228 330 226 329 214 331 207 328 197 320 197 317 176 321 165 313 162 319 137 318 117 300 116 286 109 281 94 277 89 284 82 278 79 277 60 262 54 249 54 256 54 Area code 515 poly 397 289 331 289 321 289 250 295 252 282 223 272 222 252 233 249 241 228 236 224 237 212 230 204 234 200 248 200 250 185 270 185 268 209 256 217 256 234 278 245 292 228 297 237 305 244 305 231 319 231 324 234 332 223 329 215 332 211 331 200 320 195 318 172 320 167 312 162 316 138 316 117 301 117 290 110 285 110 283 94 278 91 285 85 285 81 278 76 278 62 263 54 294 54 305 49 373 49 372 54 387 69 378 98 362 109 349 108 335 125 342 126 346 147 357 149 366 156 374 173 381 176 384 180 378 204 384 209 384 220 412 220 408 233 393 242 389 250 410 247 416 252 414 260 400 269 399 289 398 289 397 289 Area code 641 poly 130 54 255 54 256 63 248 91 243 92 240 104 254 104 253 112 244 123 252 132 246 141 247 153 238 162 245 169 247 201 230 200 230 205 238 213 235 222 242 228 238 234 238 244 233 251 223 252 223 274 253 283 252 295 174 289 170 281 164 277 169 260 168 258 168 246 163 244 163 228 159 217 155 213 153 204 151 200 151 182 139 164 139 158 134 154 133 135 118 120 130 87 130 75 123 72 124 59 130 54 Area code 712 poly 4 0 0 83 33 108 43 108 53 104 88 104 121 120 127 101 130 89 130 77 121 74 122 56 130 49 130 0 0 0 4 0 Area code 605 poly 221 365 204 343 179 319 177 306 169 293 171 281 165 278 170 261 164 245 161 217 156 215 153 203 149 199 152 181 140 164 138 155 135 154 133 132 124 122 90 103 49 104 41 108 30 108 0 83 0 365 221 365 Area code 402 poly 215 354 194 339 194 330 180 319 178 306 169 294 344 292 345 289 418 289 441 310 448 364 224 369 215 354 Area code 660 poly 130 0 133 52 296 54 304 48 445 49 429 0 130 0 Area code 507 poly 568 0 429 0 438 52 444 50 447 59 456 67 457 73 450 77 449 89 462 117 483 124 483 130 568 123 568 0 Area code 608 poly 561 124 555 125 567 221 558 241 550 261 521 205 517 204 507 204 528 184 519 184 513 176 487 142 475 129 561 124 Area code 815 poly 456 275 466 260 467 245 457 236 456 222 471 214 482 215 498 205 501 189 507 184 511 179 521 187 518 207 557 245 556 369 561 364 494 310 477 313 475 286 456 275 Area code 309 poly 561 369 449 369 445 349 435 349 441 333 436 333 437 312 442 286 458 279 461 275 476 287 477 311 480 313 494 312 561 365 561 369 Area code 217 desc bottom-left Area code 641 is a telephone area code for a central portion of Iowa, including Mason City, and Ottumwa. It was split off from area 515 on July 9 2000; this was the first such split in Iowa since the establishment of the North American Numbering Plan in 1947. The map to the right is clickable: click on any of the area codes on the map to go to the area code for that region. ==Traffic pumping== (詳細はcalling card and conference service providers operate in area 641. When one calls a rural number in area 641, the long distance provider has to pay the termination fee to the receiving telecom party: up to 8 cents a minute. Using this arbitrage, some of the service providers operate here and require one to dial the 'local access number' in area 641. Large telecom providers are the hardest hit with the costs for these so-called free service providers. AT&T filed a suit to withhold these arbitrage payments (AT&T got a $2 million bill a month). (March 2007) In 2006, various companies began using Iowa's 641 as a number to access voice over IP gateways, including one which purported to allow users to "call China for free".〔http://web.archive.org/web/20070208231638/http://www.callchinaforfree.com/〕 The scheme, no longer in operation, was based on the wholesale cost of calls to rural Iowa being substantially more than the cost of Internet calls to China. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「area code 641」の詳細全文を読む スポンサード リンク
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