S5 Data issues

The obvious interpretation of the message is that you have lost contact with your home network but the phone can see other networks that it is allowed to connect to. If you have local roaming there (i.e. roaming between other providers in your home country) or you are within range of a foreign network (which only seems possible if there is special provision for one of the US bases there) then all this means is that you have lost contact with your home network. What it doesn't tell us is why.

It could be a fault in your phone. It could be a fault in your SIM (they can develop faults, I've had it happen twice in the last decade). It could be that your provider is making some changes to their network that affect your coverage (anything from a problem with one basestation to them changing how they use some bands). It might be worth speaking to them and seeing whether there is anything changed on their side before buying a new phone, or asking them to replace your SIM (SIMs do develop faults and that can cause a loss of connection, though in my experience it usually means a total loss of connection). But I'm afraid this is all just guesswork and speculation.

 

keep us posted if the new sim cards helped or not.

 

We get a lot of people here who assume that any anomaly or anything they don't understand means that they have been hacked or infected with malware, when 19 times out of 20 it's something else (often there's nothing wrong at all, they just don't understand how these little pocket computers work). I suspect that the "support" person with your provider didn't know and just started guessing. In all honesty there is no reason at all why "hacking" would produce what you describe, and it's a lot rarer than popular media would have you think.

 

I can't answer on roaming, because I don't know whether you have domestic roaming there and what the tariff structure is if you do (I'm in the UK, and have never been to Guam).

 

Your situation is very unpleasant, for me personally roaming is very important, and that it does not give out errors when traveling to other countries. I chose the right rate with the features I needed such as roaming, free calls and many others. Most phone contracts range from 12 to 24 months, with monthly rates varying slightly depending on which contract you choose. On this site I learned a lot of the right stuff to get a new rate It is advisable to avoid signing a contract that binds you for more than 12 months. This is because a long contract will mean that you will have to wait longer before you qualify for an upgrade or you can change providers. When contracting for a cell phone, it is important to consider the amount of data you will need to use during the month. If you're someone who will use the Internet regularly for things like social media or YouTube.