Do I need to add 0 to the text messages sent by two mobile phones from other provinces?

Different telephone networks have different dialing principles. For example, when making a phone call on a fixed network, the area code is not added for local calls, the area code is added for domestic calls and the country code is added for international calls. This is because local numbers are not unique. For example, Beijing has a telephone number of 12345678, and Shanghai has a telephone number of 12345678, so you must add the area code to know where it is, otherwise it will belong to this city by default.

Mobile networks are different. First of all, the phone number of the mobile network is unique in China. You use the number 13xxxxxxxxx, so it is impossible to have the same number in another place. Secondly, the characteristics of mobile phones make it impossible for you to know where a phone number is now, whether it is in this city or elsewhere. Therefore, the dialing method in the mobile network only needs to dial the number directly, and there is no problem of adding or not adding 0.

Therefore, whether you are mobile or Unicom, whether you are local or foreign, you can dial the number at any time without adding 0. It's the same with texting.