Here’s The Fix if You Cannot Send Out SMS on iPhone 4S, 4 or 3GS

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Can’t send out SMS? You have tried inserting the full area code, and checking the signal, reseting network settings, tested your SIM card on your old phone, restoring the iPhone 4S and even setting it up as new iPhone instead of restoring it from a backup – but nothing works!

UPDATE: Just so you know, you can solve all of these issues by officially unlocking your AT&T iPhone, see here.

Oddly, the problem lies with the SMS center number. First of all, you need to check your SMS center number to make sure that it’s correct. You can check by typing the following and press Call:

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You will then get the message as shown below:

Setting Interrogation Succeeded
Service Center Address

The SMS center number or Service Center Address above is for China Mobile which is +8613800100500.

Now, if yours is incorrect you can update it by typing the following and followed by pressing Call:


SMSCNUMBER would be your mobile service provider’s Service Center Address. You can Google for it or call your customer support hotline.

As an example, if you’re on Sunrise Switzerland, the message center number is +41765980000, so the command would be:


Once you’ve done the above you will see the following message:

Setting Succeeded
Service Center Address
No Address

To confirm if the number is correct, type the following again and press Call:


What’s strange is Apple doesn’t incorporate a direct editing feature under Settings. I remember I can edit this number quite easily on an old Nokia phone.

How about helping other people by sharing your local SMS center number below? e.g. Country, Carrier and SMS Center Number.

Here’s The Fix if You Cannot Send Out SMS on iPhone 4S, 4 or 3GS was last modified: August 6th, 2018 by Joe Wang

Comments & Discussion

  1. I have a verizon iphone4 with page plus and when I do step one I just get a failed icon or it will just ring. Please help!!!!!!!!

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